Reduce PDF file size with zero quality loss
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify · Updated July 2026
Compress PDF reduces the file size of a PDF so it fits within the upload limits of email, government portals, and job-application sites — all without uploading your file anywhere. Many official portals cap uploads at 1 MB or 2 MB, while scanned documents often run much larger; this tool shrinks them down while keeping the text readable. The compression happens locally in your browser, which means even sensitive scans of IDs, certificates, or financial statements stay private. You can balance size against quality to hit a target file size without making the document illegible.
Compression primarily targets the images inside a PDF, which dominate the size of scanned documents. The tool renders or extracts page images, re-encodes them at a lower resolution and/or higher JPEG compression based on your chosen quality level, and rebuilds the PDF with the optimised images using a client-side library. Vector text and structure are preserved where possible so the document stays selectable and legible. Higher compression means a smaller file but softer images, so the quality slider lets you find the right trade-off. The entire process runs in browser memory with no server upload.
| Portal / use | Typical limit |
|---|---|
| UPSC / SSC application (photo & signature) | 20 KB – 300 KB |
| Passport Seva — document upload | Up to 2 MB per file |
| Most state & central job portals | 1 MB – 2 MB |
| College / university admission portals | 1 MB – 5 MB |
| Gmail attachment | Up to 25 MB |
Limits are indicative and change by portal — always check the specific site. Compress to just under the stated limit rather than to the smallest possible size, so the text stays sharp and readable.
Almost all of a large PDF's size comes from images, not text. A document you scanned or photographed is stored as full-resolution pictures — a few phone-camera pages can easily add up to 10–20 MB. Text-only PDFs are tiny by comparison. That is why compression works by re-encoding the images at a sensible resolution: it targets the part that actually takes up space while leaving the text alone.
The goal is not the smallest possible file — it is a file just under the portal's limit that is still clearly legible. Over-compressing makes scanned text fuzzy and can get a document rejected as unreadable. Use the quality slider to step the size down until you are comfortably under the cap (say 1.8 MB for a 2 MB limit), then check the preview. If the text is crisp, you are done.
The documents people most often need to compress — ID proofs, certificates, bank statements — are also the ones you least want to upload to an unknown server. This tool compresses entirely inside your browser, so those scans are never transmitted anywhere. You get a smaller file for the portal without handing your identity documents to a third party. If you're compressing a salary slip or loan sanction letter for a portal upload, our Salary Calculator and EMI Calculator are useful next stops for checking the numbers on that same document.
Upload your PDF to Clacify's Compress PDF tool. The tool re-compresses internal images and streams in your browser and downloads the optimised PDF. Text, vector graphics, and hyperlinks remain fully intact. For PDFs that are mainly text with no images, the size reduction will be smaller.
Upload your PDF and run the compressor. For large PDFs with many high-resolution images, compression typically reduces the size by 30–70%. If the result is still above 1 MB, try splitting the PDF into smaller sections using the Split PDF tool on Clacify.