---
title: "Crop PDF Online Free - Trim Margins and Page Size"
description: "Crop PDF pages online. Drag the frame on a full size page, or let the tool find the margins for you and trim the whole document at once. Runs in your browser with no upload."
url: "https://carthacker.com/pdf-tools/crop-pdf/"
image: "https://carthacker.com/wp-content/themes/carthacker-core/assets/og/pdf-crop-pdf.jpg?v=1791719545"
publisher: "CartHacker (carthacker.com)"
language: "en"
---

# Crop PDF Online: Trim the margins off a scan, and see exactly what survives

Drop your document into the zone below, then click any page to open it at full size with a crop frame on it. **Drag the frame, type the millimeters, or press Detect the margins and the tool finds where the ink actually starts and trims to it.** One frame for the whole document, or a different one per page. Every tile shows what will survive before you spend anything. Nothing is uploaded.

- Files never leave your device
- No installation, no watermark
- Works offline once the page is open

PDF cropper, Live

- **Privacy:** 100% private
- **Your plan:** Free to use
- **You get:** Single PDF

Your files are read by JavaScript running on your own machine. There is no upload, no queue, and no copy on our server to delete later.

The tool above is ready to use. **The guide below explains the thing that surprises people: cropping a PDF does not delete anything.** It explains what the five page boxes are and why setting only one of them produces a file that looks cropped in your reader and prints uncropped at the print shop, when trimming a scan is the right answer and when resizing is, and how to crop a document whose pages are not all the same shape.

## How to Crop a PDF Online for Free

Two minutes, nothing to install, and no account needed for your first run. This **PDF cropping tool** executes inside the page you are reading, so all four steps happen on your own machine.

1. **Drop your PDF into the emerald zone.** Click the drop zone above or drag the file anywhere onto this page. Every page appears as a tile, and each one will show the crop frame as soon as you set it.
2. **Open a page and drag the frame.** Click any tile and the page fills the screen with a crop frame on it. Drag the frame, drag its handles, or type the trim for each edge in millimeters. The area outside the frame is grayed out, so what you are about to lose is never a guess.
3. **Or let the tool find the margins.** Press Detect the margins and every page is examined for where the ink actually starts and stops, then trimmed to it with a hair of padding. On a scan with wide white borders this is usually the only step you need.
4. **Choose one crop or one per page, then run it.** Leave One crop for the whole document on and the frame applies everywhere, which is what a uniform scan wants. Switch it off to crop pages individually. Then press Crop PDF and the file comes back immediately.

The frame carries a rule of thirds grid and a live millimeter readout, and the handles are sized for a fingertip instead of a mouse pointer, because a large share of the people cropping a document are doing it on a phone with the scan somebody just emailed them.

## Cropping a PDF Does Not Delete Anything

This is the single most important thing on this page and almost nobody says it. **Cropping a PDF changes which part of the page is displayed. It does not delete the content outside the frame.** The text, the images and the marks you trimmed away are all still sitting in the file exactly as they were, and anybody who opens the document in different software, or pulls it apart programmatically, can still read every one of them. They are outside the region a reader was told to paint. Nothing more.

That is not a limitation of this tool. It is what cropping means in the PDF format, in every application that implements it, including the expensive ones. A page is drawn in an infinite coordinate space, and a small set of rectangles in the page dictionary decides which part of that space a viewer actually paints onto your screen. Cropping moves the rectangles.

Four consequences follow, and all of them matter before you rely on it:

- **Anybody can restore the original view.** Setting the boxes back to the original values brings the trimmed area straight back, and there are free tools that do it in one command.
- **Text extraction still finds the cropped-away text.** Copying all the text out of a cropped page returns the words in the margins as well. So does any search index that reads the file.
- **The file does not get smaller.** Nothing was removed, so nothing was saved. A cropped 40 MB scan is still a 40 MB scan.
- **Printing honors it correctly.** A printer prints what the crop box says, so a cropped page prints cropped, which is the case people actually care about.

**If you are cropping to hide something, stop.** Cropping a signature, an address or a price out of the visible area leaves it fully readable to anyone who copies the text or resets the boxes. That is a redaction failure, and it is one of the most common ways confidential information escapes. Use [Redact PDF](https://carthacker.com/pdf-tools/redact-pdf/), which destroys the content instead of hiding the view of it.

Cropping is the right tool for making a document readable, printable and pleasant. It is the wrong tool for making something disappear, and being clear about which job you are doing takes ten seconds.

## The Engineering Behind a PDF Crop: Five Boxes, Not One

A PDF page can carry five rectangles, and the difference between a crop that works everywhere and one that works in your reader only is which of them a tool bothers to set.

| Box | What it means | Who reads it |
| --- | --- | --- |
| MediaBox | The physical sheet the page was made for. The only mandatory box, and the one everything else must sit inside. | Everything. Print drivers in particular treat it as the paper size. |
| CropBox | The region a viewer should display. Defaults to the MediaBox when absent. | Screen readers and most print paths. |
| BleedBox | The region including print bleed, for production. | Prepress software and commercial printers. |
| TrimBox | The intended finished size after trimming. | Prepress software, imposition tools. |
| ArtBox | The meaningful content area, for placement in other documents. | Layout applications importing the page. |

### Why setting only CropBox is not enough

Most online croppers set CropBox and stop. In your browser the page looks perfectly cropped, which is why the bug survives. Then the file is sent to a print shop, or opened in a layout application, or run through an imposition tool, and **the original margins come back, because those tools read MediaBox and TrimBox and the file still says the sheet is A4**.

This tool sets all five to the same rectangle. That is what "cropped" has to mean if the word is going to survive contact with a printer:

- **MediaBox** so the file honestly reports its new sheet size to every print path.
- **CropBox** so every reader displays it correctly.
- **BleedBox, TrimBox and ArtBox** so prepress and layout software agree with the other two rather than reverting to the original geometry.

### The content is not rewritten

Nothing inside the page is touched. The content streams, the fonts, the images and the annotations are all byte identical to the ones you dropped in, and only the box entries in the page dictionary change. That is what makes the operation instant on a two hundred page document and what keeps the text layer, the links and the bookmarks working afterwards. It is also why the file does not get smaller: cropping deletes nothing, it only changes what is displayed.

### Rotated pages, handled properly

A page stored sideways with a rotation flag is displayed upright, so the frame you drag is not aligned with the coordinate system the boxes are written in. Both corners of your frame are mapped from the page as you see it into the file coordinate system and then normalized, so **a rotated page crops where you pointed and not ninety degrees away from it**. Other tools fail here constantly. You usually find out after sending the file.

## How Detect the Margins Works, and When to Trust It

Pressing **Detect the margins** renders each page to a small bitmap, walks every pixel looking for anything that is not paper, and trims to the bounding box of what it finds, plus about one percent of the page as breathing room.

Three design choices in that sentence are worth explaining, because they decide when it works:

- **The page is rendered small, around 700 pixels on the long edge.** Detection needs the bounding box of the ink, not the detail of it. At that size a one millimeter rule is still several pixels wide and reliably found, and the whole pass takes milliseconds per page instead of seconds.
- **The tolerance from pure white is generous.** Scanned paper is never actually white. It is a light grey with a colour cast that depends on the lamp, and a strict test would decide the entire sheet is content and trim nothing at all.
- **A blank page returns nothing rather than a crop.** A page with no ink on it has no bounding box, and cropping it to a point would be worse than leaving it. It is left alone.

### When it works well

- Scans of a smaller document on larger paper, which is the classic case: an A5 booklet or a receipt scanned on an A4 flatbed.
- Book scans with wide white borders around the type block.
- Anything exported with generous default margins that nobody wanted.

### When it will disappoint you

- **Scans with a dark edge.** A flatbed with the lid open produces a black border, and a photograph of a page includes the desk. Both are ink as far as the detector is concerned, so it trims nothing. Drag the frame by hand instead.
- **Pages with a header, a footer or a page number you wanted gone.** Those are ink and they will be kept. Crop by hand if the point was to remove them.
- **Speckled or dusty scans.** A single dark speck in the corner is the bounding box. If the result looks like nothing was trimmed, that is usually why, and cleaning the glass is a more permanent fix than any software.
- **Documents where the pages differ.** With one crop for the whole document, the first page is measured and its frame is applied everywhere. Switch that off and every page is measured on its own, which takes longer and is correct for a mixed document.

**Always open one page full size afterwards.** Automatic detection is a good first guess and it is a guess. Ten seconds looking at the frame on a real page is what stops you trimming the last line off every page of a two hundred page report.

## When Cropping Is the Right Answer, and When It Is Not

Cropping solves a specific set of problems well and is a poor substitute for several other operations. Knowing which is which saves a lot of time.

### Genuinely good reasons to crop

- **A small document scanned on big paper.** A receipt or an A5 leaflet on an A4 flatbed wastes half the sheet and makes the content tiny on a phone screen. Cropping to the content makes it readable.
- **Reading on a tablet or an e-reader.** This is the strongest case there is. A journal PDF with 30 mm margins shows the type at half the size it could, and cropping the margins away is the difference between a readable article and a squint.
- **Double page book scans.** Split each spread into two pages, or crop to one side at a time, so the result is a page per page rather than a spread per page.
- **Removing scanner artifacts.** The black strip down one edge, the shadow of the spine, the fragment of the next page.
- **Presenting one region.** A drawing set where only the title block matters, or a spreadsheet export where only the summary table is needed.

### Problems that look like cropping and are not

| What you want | The right tool | Why not cropping |
| --- | --- | --- |
| The file to be smaller | Compression, or reducing the resolution of the images inside it. | Cropping removes nothing from the file, so the size does not move at all. |
| Something to be unreadable | [Redact PDF](https://carthacker.com/pdf-tools/redact-pdf/) | Cropped-away text is still in the file and still extractable by anyone. |
| A page gone entirely | [Remove Pages](https://carthacker.com/pdf-tools/remove-pages/) | Cropping a page to nothing leaves a page. Delete it instead. |
| A sideways page upright | [Rotate PDF](https://carthacker.com/pdf-tools/rotate-pdf/) | Cropping cannot turn anything. It only chooses a rectangle. |
| Everything scaled to fit A4 | Printing with scale to fit, or re-exporting from the source. | Cropping changes the sheet size rather than scaling the content, so the type stays the size it was. |
| A margin added rather than removed | Re-exporting from the source document. | This tool trims inward only. It cannot make a page bigger than the sheet it was drawn on. |

## One Crop for Everything, or One Per Page

The switch marked **One crop for the whole document** decides whether the frame you set applies everywhere or only to the page you set it on. Both are correct for different documents and the default is uniform, because most documents that need cropping are scans where every sheet went through the same feeder in the same position.

The frame is stored as a proportion of each page instead of as an absolute rectangle, which is what makes the uniform mode meaningful. **Trim eight percent off the left edge and every page loses eight percent of its own width**, so a document with an A3 foldout in the middle gets a proportionally identical crop rather than one that eats half the foldout.

### When to switch it off

- A document assembled from several sources, where the margins genuinely differ page to page.
- A book scan where left hand and right hand pages have the binding on opposite sides, so the crop needs to mirror.
- Anything with a mix of portrait and landscape pages where the wasted space is in a different place on each.

With it off, opening a page and setting a frame affects only that page, and Detect the margins measures every page individually. On a long document that takes noticeably longer, because every page has to be rendered, and it is the correct trade for a document that genuinely varies.

The switch appears in two places, in the panel and inside the full size editor, and they are wired to each other instead of kept separately. Changing it in one place changes it in the other immediately, because two controls for one setting is how a tool ends up cropping a single page while the switch on screen says all of them.

## Zero-Trust: Your Document Never Reaches Our Server

The usual architecture for a free **crop PDF online** service is an upload form, a queue, a command line utility on a server you do not control, and a temporary download link. Your document crossed the internet. It sat on a disk you cannot inspect for however long a privacy page claims. Look at what people actually crop: scans of things that were on paper for a reason, which means contracts, deeds, medical letters, bank statements and identity documents.

There is no upload form here, and no queue behind it. Your file opens through the browser File API. A PDF library running as JavaScript on your own processor rewrites the page boxes, and the cropped document arrives as a Blob your browser downloads from itself. **The file exists on your disk and in your RAM, and nowhere else.**

### Verify it in thirty seconds

1. Open developer tools, switch to the Network panel, and clear it.
2. Crop a document, including a run of Detect the margins. Watch the requests.
3. You will see the engine scripts load once and one small JSON call carrying the tool name. No request contains your PDF, and none is remotely the size of one.
4. The definitive version: load this page, disconnect from the network completely, then crop anyway. It works, because there is no server-side step for it to depend on.

Detect the margins is worth calling out here, because it is the most computationally expensive thing on the page and it is entirely local: **every page is rasterized and every pixel examined on your own processor**. That is why a four hundred page document takes a moment on a laptop, and it is the same reason nothing about your document is knowable to us.

## When a Crop Goes Wrong, and What It Means

| Symptom | Cause | Fix |
| --- | --- | --- |
| Detect the margins trimmed nothing | Something dark is touching the edge: a scanner shadow, a black border from an open lid, or a speck of dust. All of it counts as ink. | Drag the frame by hand. It takes ten seconds and it is exact. |
| The crop reverted at the print shop | Whatever produced the file set only CropBox and left the original sheet size in MediaBox. | Crop it here instead. All five page boxes are set to the same rectangle, so every print path agrees. |
| The file is the same size as before | Cropping removes nothing from the file. It changes which region is shown. | Correct behavior, not a fault. If you need a smaller file, the images inside it are the lever, not the boxes. |
| Text I cropped away is still searchable | Same reason. The content is outside the visible region and still in the document. | If it must be gone, use Redact PDF. Cropping was never going to do that. |
| The crop landed on the wrong side | The page is stored rotated and the tool that made it did not map the frame into the file coordinate system. | That is exactly what is handled here. If it still happens, open the page full size and check the frame against the visible content. |
| Some pages are cropped wrongly | One frame is being applied to a document whose pages differ. | Switch off One crop for the whole document and set those pages individually. |
| The card says Locked | The document is encrypted with a password. | Open it in a reader with the password, save an unencrypted copy, and crop that. |
| A signature warning appears afterwards | The document was digitally signed, and any change invalidates a signature. | Crop before signing. No tool can change page geometry without breaking a signature that covers it. |

### Before cropping a long document

1. Set the frame on page one and open two or three other pages at full size to check it.
2. Look specifically at the page with the most content, not the emptiest one. The tight page is the one that gets clipped.
3. Run it, then open the result and check the same pages again.
4. Keep the original. Cropping is reversible in principle and awkward in practice, and the original costs you nothing to keep.

## What People Usually Do Straight After Cropping

Cropping is normally one step in cleaning up a scan. These are the ones that come with it:

- **The pages are sideways.** [Rotate PDF](https://carthacker.com/pdf-tools/rotate-pdf/) turns them and saves the rotation permanently, and it is worth doing before cropping so the frame is drawn on an upright page.
- **The pages are out of order, or some are blank.** [Organize PDF](https://carthacker.com/pdf-tools/organize-pdf/) and [Remove Pages](https://carthacker.com/pdf-tools/remove-pages/) deal with both.
- **Each spread should be two pages.** Crop to one side, then to the other, and [Merge PDF](https://carthacker.com/pdf-tools/merge-pdf/) to interleave the results.
- **It needs numbering now that it is a proper document.** [Add Page Numbers](https://carthacker.com/pdf-tools/add-page-numbers/).
- **It should be images rather than a document.** [PDF to JPG](https://carthacker.com/pdf-tools/pdf-to-jpg/) and [PDF to PNG](https://carthacker.com/pdf-tools/pdf-to-png/) export the cropped region, since they render what the crop box says.

## Frequently Asked Questions

### How do I crop a PDF for free?

Drop the file into the zone above and click any page tile. The page opens at full size with a crop frame on it that you drag with a finger or a mouse, or you can type the trim for each edge in millimeters. Press Crop PDF and the file comes back immediately. It is free, there is no watermark on the result, and no account is needed for your first run. An anonymous visitor gets one operation per 12 hours, a free CartHacker account gets two, and Premium removes the counter.

### Does cropping a PDF delete the content outside the frame?

No, and this catches almost everybody. Cropping changes which region of the page a reader displays, and **the content outside the frame stays in the file exactly as it was**. Anyone can restore the original view by resetting the page boxes, anyone who opens the document in different software can still reach the trimmed area, and text you cropped away is still returned by text extraction and by any search index that reads the file. That is how cropping works in the PDF format, in every application including the expensive ones. If something needs to be genuinely gone, redaction is the operation you want.

### Why did my cropped PDF go back to full size at the print shop?

Because whatever cropped it set only the CropBox and left the original sheet size sitting in the MediaBox. Screen readers honor CropBox, so it looked right to you, while the print and prepress software at the shop read MediaBox and TrimBox instead and reverted to the original geometry. This tool sets **all five page boxes to the same rectangle**. That is what makes a crop survive contact with a printer.

### Can the tool find the margins automatically?

Yes. Press Detect the margins and each page is rendered small, examined pixel by pixel for where the ink actually starts and stops, and trimmed to that bounding box with about one percent of padding. It works very well on scans with white borders and it fails predictably on scans with a dark edge or a speck of dust in the corner, because both count as ink. Always open one page at full size afterwards to check the result.

### Can I crop each page differently?

Yes. Switch off One crop for the whole document and every page keeps its own frame, so you can set page 3 one way and page 4 another. With it on, one frame applies everywhere, stored as a proportion of each page, so a document containing an A3 foldout gets a proportionally identical crop rather than one that eats half the foldout.

### Does cropping make the PDF file smaller?

No. Nothing is removed from the file, so nothing is saved. Only the page box entries in each page dictionary change, and the content streams stay byte identical. That is also why the operation is instant on a long document and why the text layer, the links and the bookmarks all keep working exactly as they did before you touched it. If you need a smaller file, **the images inside it are the lever, not the page boxes**.

### Will cropping break the text or the links?

No. **The content of the page is not touched at all**, so the text stays selectable and searchable, hyperlinks and bookmarks keep working, and form fields stay fillable. The one thing that breaks is a digital signature covering the document, because any modification invalidates a signature. Crop before signing rather than after.

### Can I crop a PDF on my phone?

Yes, and it is designed for it. The crop handles are 24 pixels across rather than the usual 10, because they are dragged with a fingertip on a large share of the traffic these tools get. The page opens full screen, the frame carries a live millimeter readout, and the tool rail stays reachable rather than being hidden on small screens.

### Does it handle rotated pages correctly?

Yes, and this is where a lot of tools quietly fail. A page stored sideways with a rotation flag is displayed upright, so the frame you drag is not aligned with the coordinate system the page boxes are written in. Both corners of your frame are mapped from the page as you see it back into the file coordinate system, so the crop lands where you pointed rather than ninety degrees away from it.

### Can I make a page bigger or add a margin?

No. This tool trims inward only. A page box cannot be larger than the sheet the content was drawn on, so there is no honest way to invent space that was never there. If you need bigger margins, re-export from the source document, or place the page into a larger one from your layout software.

### Are my documents uploaded to your server?

No. The crop runs in your browser on your own processor and your document is never transmitted anywhere. Detect the margins is the most expensive thing on the page and it is entirely local: **every page is rasterized and every pixel examined on your own machine**. Load this page, disconnect from the internet completely, and the whole tool still works.

### What is the best way to crop a book scan for an e-reader?

Press Detect the margins first. Then open two or three pages at full size and **check the frame against the page with the most content on it, never the emptiest one**. Book scans usually have a wide inner margin near the spine that the detector keeps, because the shadow counts as ink, so a small manual adjustment on that edge is normal. Leave One crop for the whole document on unless the left and right hand pages genuinely mirror each other.

## The rest of the PDF suite

All of these run the same way: your file is read by JavaScript on your own machine, the work happens on your processor, and the result is handed back to you as a download that never existed anywhere else.

Organize PDF

- [Merge PDF](https://carthacker.com/pdf-tools/merge-pdf/)
- [Split PDF](https://carthacker.com/pdf-tools/split-pdf/)
- [Remove Pages](https://carthacker.com/pdf-tools/remove-pages/)
- [Extract Pages](https://carthacker.com/pdf-tools/extract-pages/)
- [Organize PDF](https://carthacker.com/pdf-tools/organize-pdf/)
- [Scan to PDF](https://carthacker.com/pdf-tools/scan-to-pdf/)

Convert to PDF

- [JPG to PDF](https://carthacker.com/pdf-tools/jpg-to-pdf/)
- [PNG to PDF](https://carthacker.com/pdf-tools/png-to-pdf/)
- [WebP to PDF](https://carthacker.com/pdf-tools/webp-to-pdf/)
- [AVIF to PDF](https://carthacker.com/pdf-tools/avif-to-pdf/)
- [GIF to PDF](https://carthacker.com/pdf-tools/gif-to-pdf/)
- [BMP to PDF](https://carthacker.com/pdf-tools/bmp-to-pdf/)
- [Word to PDF](https://carthacker.com/pdf-tools/word-to-pdf/)
- [PowerPoint to PDF](https://carthacker.com/pdf-tools/powerpoint-to-pdf/)
- [Excel to PDF](https://carthacker.com/pdf-tools/excel-to-pdf/)
- [HTML to PDF](https://carthacker.com/pdf-tools/html-to-pdf/)

Convert from PDF

- [PDF to JPG](https://carthacker.com/pdf-tools/pdf-to-jpg/)
- [PDF to PNG](https://carthacker.com/pdf-tools/pdf-to-png/)
- [PDF to WebP](https://carthacker.com/pdf-tools/pdf-to-webp/)
- [PDF to AVIF](https://carthacker.com/pdf-tools/pdf-to-avif/)
- [PDF to GIF](https://carthacker.com/pdf-tools/pdf-to-gif/)
- [PDF to BMP](https://carthacker.com/pdf-tools/pdf-to-bmp/)
- [PDF to Word](https://carthacker.com/pdf-tools/pdf-to-word/)
- [PDF to PowerPoint](https://carthacker.com/pdf-tools/pdf-to-powerpoint/)
- [PDF to Excel](https://carthacker.com/pdf-tools/pdf-to-excel/)
- [PDF to HTML](https://carthacker.com/pdf-tools/pdf-to-html/)
- [PDF to PDF/A](https://carthacker.com/pdf-tools/pdf-to-pdfa/)
- [PDF to Markdown](https://carthacker.com/pdf-tools/pdf-to-markdown/)

Edit PDF

- [Rotate PDF](https://carthacker.com/pdf-tools/rotate-pdf/)
- [Add Page Numbers](https://carthacker.com/pdf-tools/add-page-numbers/)
- [Add Watermark](https://carthacker.com/pdf-tools/add-watermark/)
- Crop PDF
- [Edit PDF](https://carthacker.com/pdf-tools/edit-pdf/)

PDF Security

- [Unlock PDF](https://carthacker.com/pdf-tools/unlock-pdf/)
- [Protect PDF](https://carthacker.com/pdf-tools/protect-pdf/)
- [Sign PDF](https://carthacker.com/pdf-tools/sign-pdf/)
- [Redact PDF](https://carthacker.com/pdf-tools/redact-pdf/)

Optimize PDF

- [Repair PDF](https://carthacker.com/pdf-tools/repair-pdf/)
- [OCR PDF](https://carthacker.com/pdf-tools/ocr-pdf/)

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---

Source: [Crop PDF Online Free - Trim Margins and Page Size](https://carthacker.com/pdf-tools/crop-pdf/), CartHacker.

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