Is my PDF uploaded to a server?

No. The entire compression happens inside your browser. Your file is read into memory on your own device, each page is re-rendered and re-encoded locally, and the smaller PDF is handed straight back to you as a download — no byte of the document is ever sent to us or anyone else. This is why the tool is safe for sensitive scans like bank statements, forms, and identity documents. Close the tab and nothing is retained.

Why is the text in my compressed PDF no longer selectable?

Because of how browser-based compression works. To shrink the file, the tool re-renders each page as a JPEG image at a lower resolution and rebuilds the PDF from those images. That means any real text on the page becomes part of an image, so it can no longer be selected, copied, or searched. This is a deliberate tradeoff: it is what makes large scans shrink so much. If you need the text to stay selectable, this tool is not the right choice for that document.

Which kinds of PDFs compress well here?

Scanned documents and photo-heavy PDFs compress the most, because their pages are already images and rasterizing them at a lower resolution removes a lot of data you do not need for everyday use. Text-only PDFs, by contrast, are usually already small and may not shrink much — and they lose their selectable text in the process. As a rule: reach for this tool when your PDF is a scan or is full of pictures and is too big to upload or email.

What is the difference between the Strong, Balanced, and Light presets?

They set how aggressively each page is re-rendered. Strong uses the lowest resolution and image quality for the smallest possible file, which is best when you are fighting a strict size limit. Balanced, the default, is a sensible middle ground for most scans. Light keeps more resolution and quality, producing a clearer file with a smaller size reduction. All three use the same method; they differ only in how much detail they keep.

What happens if compressing makes the file bigger?

The tool checks the result against your original. If the compressed copy comes out the same size or larger — which can happen with PDFs that are already well optimized or are mostly text — it does not hand you the worse file. Instead it keeps your original, lets you download that unchanged, and tells you the document was already optimized. You never end up with a larger or lower-quality file than you started with.

Is there a limit on file size or page count?

There is no hard limit, because the work is done by your own device rather than a server with quotas. Very large or very long PDFs use more memory and take longer, since each page is rendered one at a time to keep your browser responsive. For typical scans of a few to a few dozen pages, compression finishes quickly.

Convert

Compress PDF

Shrink a PDF’s file size right in your browser — best for scanned and image-heavy documents. Nothing is uploaded. Free, no signup.

By the Samastam teamLast updated 2026-06-13

Drop a PDF here, or click to browse

Everything runs in your browser — nothing is uploaded

A PDF compressor reduces the file size of a PDF so it is easier to email, upload, or store. This tool works entirely in your browser by re-rendering each page at a lower resolution and re-encoding it as a JPEG image, then rebuilding the PDF — an approach that shrinks scanned and photo-heavy documents dramatically. Because pages are turned into images, text in the compressed file is no longer selectable or searchable, so the tool is built for scans and image-based PDFs rather than text documents you need to copy from.

Key takeaways

This compressor re-renders each page as an image at a lower resolution and quality, which is why it shrinks scanned and photo-heavy PDFs so effectively.
It runs fully in your browser — the PDF is read and compressed locally with no upload, so sensitive scans like statements, forms, and IDs never touch a server.
Because pages become images, the compressed PDF’s text is no longer selectable or searchable — this is the right tradeoff for scans, but not for text documents you need to copy from.
Three presets let you balance size against quality: Strong for the smallest file, Balanced for everyday use, and Light when you want to keep more visual detail.
If a PDF is already well optimized and compressing would make it larger, the tool keeps your original file instead of handing back a worse one.

What this is and why it matters

PDFs balloon in size for one main reason: images. A scanned document, a photo-heavy brochure, or a form filled with embedded pictures can easily run to tens of megabytes — far past the upload limits that government portals, job applications, and email systems impose. “Your file must be under 2 MB” is one of the most common roadblocks people hit, and a large scan blows straight through it. Compressing the PDF brings it back under the cap so it can actually be submitted.

This tool compresses in the browser rather than on a server, for the same privacy reason as the rest of the toolkit. The PDFs people most need to shrink are sensitive: scanned bank statements, salary slips, Aadhaar and PAN copies, signed forms, medical records. Uploading those to an unknown compression site just to reduce their size is a poor trade. Here, the file is read into memory on your own device, each page is re-rendered and re-encoded locally, and the smaller PDF is handed straight back to you. Nothing is transmitted and nothing is stored.

It is important to understand how this compression works, because it involves a real tradeoff. Each page is rasterized — redrawn as a flat JPEG image at a reduced resolution — and the PDF is rebuilt from those images. For scanned documents, which are already images, this is nearly all upside: big size savings with little visible loss. But for PDFs that contain real digital text, that text becomes part of an image, so it can no longer be selected, copied, or searched. That is why this tool is positioned for scans and image-heavy files, and why it tells you about the tradeoff before you run it rather than surprising you afterward.

How to use this tool

Add your PDF. Drag the file onto the drop zone above, or click it to open the file picker and choose a PDF from your device. The moment it is selected, the tool reads it locally and shows the file name, its page count, and its current size, so you know your starting point. Nothing uploads — the reading and everything that follows happens on your own machine.

Read the tradeoff note. Before you compress, the tool reminds you that compression converts pages to images, which means the text in the result may no longer be selectable or searchable. This is ideal for scanned or photo-heavy documents and not recommended for text files you need to copy from. Taking a moment to confirm this matches your document avoids surprises later.

Choose a preset. Three options trade size against quality. Strong renders at the lowest resolution and quality for the smallest possible file — good when you are fighting a strict upload cap. Balanced is the recommended default and suits most everyday scans. Light keeps more visual detail with a smaller size reduction, for when readability matters more than squeezing every kilobyte. Balanced is selected by default.

Compress and download. Press Compress PDF and the tool works through the document page by page, showing its progress. When it finishes, it shows the original size next to the new size and how much smaller the file is, then offers the compressed PDF for download. If compression would have made the file larger — which can happen with already-optimized PDFs — it keeps your original instead and tells you so.

Examples and use cases

Getting a scanned application under a portal’s 2 MB cap

A Jaipur applicant has a six-page scanned application form that comes to 9 MB — well over the government portal’s 2 MB limit. Running it through this tool on the Balanced preset rasterizes each scanned page at a lower resolution and brings the file to around 1.5 MB, comfortably under the cap. Because the pages were already scans, nothing important is lost, and the sensitive form was never uploaded to a third-party compressor.

Emailing a photo-heavy report that bounced

A Surat consultant’s 15 MB site-inspection report — full of embedded photos — bounces back from a client’s inbox for exceeding the attachment limit. Choosing the Strong preset compresses the photos hard and drops the file to about 3 MB, small enough to send, while the images remain clear enough to review.

Shrinking a scanned bank statement set for upload

A Pune freelancer needs to upload three months of scanned bank statements as one PDF for a loan application, but the merged file is too large. After merging, they compress it here on Balanced; the statement scans shrink substantially, the account details stay readable, and nothing leaves the browser — important for a financial document.

Keeping the original when compression would not help

A Bengaluru designer tries to compress a lean, text-only contract that is already small and well optimized. The tool detects that a compressed copy would actually be larger than the original, so it keeps the original file and tells the designer it is already optimized — avoiding handing back a bigger, lower-quality version.

Frequently asked questions

Is my PDF uploaded to a server?: No. The entire compression happens inside your browser. Your file is read into memory on your own device, each page is re-rendered and re-encoded locally, and the smaller PDF is handed straight back to you as a download — no byte of the document is ever sent to us or anyone else. This is why the tool is safe for sensitive scans like bank statements, forms, and identity documents. Close the tab and nothing is retained.
Why is the text in my compressed PDF no longer selectable?: Because of how browser-based compression works. To shrink the file, the tool re-renders each page as a JPEG image at a lower resolution and rebuilds the PDF from those images. That means any real text on the page becomes part of an image, so it can no longer be selected, copied, or searched. This is a deliberate tradeoff: it is what makes large scans shrink so much. If you need the text to stay selectable, this tool is not the right choice for that document.
Which kinds of PDFs compress well here?: Scanned documents and photo-heavy PDFs compress the most, because their pages are already images and rasterizing them at a lower resolution removes a lot of data you do not need for everyday use. Text-only PDFs, by contrast, are usually already small and may not shrink much — and they lose their selectable text in the process. As a rule: reach for this tool when your PDF is a scan or is full of pictures and is too big to upload or email.
What is the difference between the Strong, Balanced, and Light presets?: They set how aggressively each page is re-rendered. Strong uses the lowest resolution and image quality for the smallest possible file, which is best when you are fighting a strict size limit. Balanced, the default, is a sensible middle ground for most scans. Light keeps more resolution and quality, producing a clearer file with a smaller size reduction. All three use the same method; they differ only in how much detail they keep.
What happens if compressing makes the file bigger?: The tool checks the result against your original. If the compressed copy comes out the same size or larger — which can happen with PDFs that are already well optimized or are mostly text — it does not hand you the worse file. Instead it keeps your original, lets you download that unchanged, and tells you the document was already optimized. You never end up with a larger or lower-quality file than you started with.
Is there a limit on file size or page count?: There is no hard limit, because the work is done by your own device rather than a server with quotas. Very large or very long PDFs use more memory and take longer, since each page is rendered one at a time to keep your browser responsive. For typical scans of a few to a few dozen pages, compression finishes quickly.