Compress PDF Online — Free, Fast & Secure

Reduce PDF file size without losing readability

Almost every online form in India puts a hard cap on file size. A government job application may refuse anything above 200KB, a college portal may stop at 500KB, and email attachments start failing well before 25MB. This compressor shrinks a PDF down to fit those limits while keeping the text sharp enough to read and print.

Compression works by re-encoding the images inside the PDF and stripping data the file does not need — embedded thumbnails, duplicated fonts, editing history and metadata left behind by the scanner or the app that created it. A scanned document is mostly photographs of paper, which is why scans compress dramatically while a text-only PDF exported from Word may already be near its floor.

Because everything runs inside your browser, the document is never uploaded. That is the practical difference when the PDF is an Aadhaar copy, a bank statement, a marksheet or a signed agreement.

Who uses this most

• Government and exam applications — SSC, UPSC, IBPS, RRB and state PSC portals routinely cap documents at 100KB to 500KB and reject anything larger without explaining why.
• College and university portals — Admission and scholarship forms often want a single PDF of certificates under a fixed size.
• Job applications — Recruiter inboxes and ATS systems silently drop oversized attachments.
• Email attachments — Gmail stops at 25MB, many corporate mail servers at 10MB, and some at 5MB.
• WhatsApp document sharing — Documents above 100MB will not send at all, and large files are slow on mobile data.
• Visa and passport paperwork — Embassy upload portals are among the strictest, frequently capping at 500KB or 1MB per document.

How to use the compress pdf

1. Add your PDFDrag the file onto the drop area or click to browse. You can also select several PDFs if you need to compress a batch in one sitting.
2. Pick a compression levelLight keeps quality closest to the original, Standard is the balanced default that suits most uploads, and Strong pushes the size down hardest for very tight limits.
3. Start compressionProcessing happens on your own device. A large scanned file takes longer than a small text PDF, and the time depends on your phone or computer rather than your internet speed.
4. Check the resultCompare the new size against the original. If it is still above the limit, run it again at a stronger level.
5. DownloadSave the compressed PDF. The original file on your device is untouched, so nothing is lost if you need to start over.

Which compression level should you choose?

There is no single correct setting. The right choice depends on what happens to the document afterwards — a file meant for printing needs more detail than one that will only ever be viewed on screen.

Common problems and how to fix them

The file barely got smaller

Your PDF is probably already optimised — a text PDF exported directly from Word, Google Docs or LaTeX has very little redundant data to remove. There is a floor below which a PDF cannot shrink without deleting actual content. If you need it much smaller, the realistic option is to split it and upload fewer pages.

Text became blurry after compression

You used a level stronger than the document needed. Run the original again at Light or Standard. Scanned documents suffer most because their text is really an image, so every compression step degrades it.

Still above the upload limit

Try Strong first. If it still will not fit, use the Split PDF tool to separate the document and upload it in parts, or rescan the original at 200 DPI instead of 600 DPI — over-scanning is the single most common cause of an enormous PDF.

The tool is slow or the tab freezes

All the work happens on your device, so a very large file on an older phone will struggle. Close other tabs, or switch to a desktop browser for files above roughly 50MB.

The page count or content changed

It should not. Compression re-encodes images and strips metadata but never removes pages. If something looks missing, the original file was likely already damaged — open it in a PDF reader to confirm before compressing.

Getting the smallest file without ruining it

• Scan at 200–300 DPI. Scanning at 600 DPI produces a file several times larger with no visible benefit for ordinary documents.
• Scan in greyscale or black and white unless colour genuinely carries information. A colour scan of a black-and-white page wastes most of the file size.
• Compress once, not repeatedly. Each pass degrades quality further, and a second pass on an already-compressed file gains very little.
• If a form asks for photographs and documents separately, compress the photo with the image compressor instead — image tools give you finer control than PDF compression.
• Keep the original. Always compress a copy so you can go back if the portal later asks for a higher-quality version.
• Check the compressed file before uploading. Open it and confirm signatures, stamps and small print are still legible.

Your file never leaves your device

Compression is performed entirely by your browser using JavaScript, so the PDF is read from your device, processed in memory and written straight back to your downloads folder. This matters most when the document is personal — an Aadhaar or PAN scan, a bank statement, a salary slip, a medical report or a signed contract. With a server-based converter you are trusting an unknown company with that file. Here there is nothing to trust, because the file is never transmitted anywhere.

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