Compress PDF Online Free
Reduce PDF file size directly in your browser. Your file stays on your device — nothing is uploaded to KbSnap.
Which size should you pick?
| Your form's limit | What usually fits |
|---|---|
| Up to 100KB | 1–2 scanned pages, e.g. a single certificate or a marksheet front and back |
| Up to 200KB | 3–5 scanned pages, e.g. a degree with marksheets or a multi-page letter |
| Any other limit | Pick 50KB, 300KB or 500KB in the tool, or type a custom size |
Won’t go small enough? Remove pages the form does not ask for, rescan the heaviest page in greyscale and cropped to the paper edge, or check whether the form allows a larger limit. Always use the limit printed in your form’s instructions.
How to compress a PDF
- 1. Select your PDF: tap to upload or drag and drop.
- 2. Choose a target size: 100KB, 200KB, 300KB, or a custom limit.
- 3. Process the file: watch page-by-page progress in your browser.
- 4. Download: check the actual compressed size before saving.
Need to reduce a certificate PDF before uploading? This tool works well for exam and government application forms with strict size limits.
Text stays selectable when possible
KbSnap first shrinks the photos and scans embedded in your PDF and leaves text untouched. Only if that cannot reach your target are pages converted into images — the result tells you which method was used. Check the official application instructions for the file size and format your portal requires.
Why a PDF is too big — and what actually shrinks it
Almost all the weight in a document PDF comes from images: scanned pages, phone photos of certificates, or a signature pasted in at full camera resolution. The text itself takes very little space. That is why a one-page marksheet photographed on a modern phone can be 3–5MB, while a ten-page typed report is often under 200KB.
KbSnap first recompresses only the images inside the PDF and leaves the text layer alone, so typed text stays sharp and selectable. If that is not enough to reach your limit, it renders each page as an image and compresses the pages instead. The result panel tells you which method was used, so you know whether the text can still be selected or searched.
Picking a target size for an application portal
Read the upload rules in the notification and choose the limit it states, not a smaller number. A certificate squeezed far below the limit can become hard to read, and the verifying officer still has to read it. For a single-page certificate or marksheet, 100KB or 200KB usually keeps the text clear. For a document with several pages, give each page roughly 30–60KB; if the total limit is too tight, upload only the pages the form asks for.
If the result says the target was not reached, try the next size up, or remove blank and duplicate pages before compressing. Password-protected PDFs have to be unlocked in your PDF viewer first.
Better scans make smaller files
Scan or photograph documents in good light on a dark, plain surface, crop away the table around the paper, and avoid shadows from your hand or phone. A clean page with a white background compresses far better than a grey, shadowed one, so you can reach a lower KB limit without losing readability. Files are processed in your browser and are not uploaded to KbSnap.
Compress PDF to a specific size
Each size page explains what fits at that limit and what to try when a PDF won't go lower. For other sizes, pick a target in the tool above.
Related tools
Keep only the pages the form asks for, so each page gets more of the size limit.
JPG to PDF Converter →Combine photos or scans into one PDF, under 100KB, 200KB, or any size.
Merge PDF →Combine several certificates into one PDF, optionally under 200KB.
Resize Image to KB →Need a passport-size photo instead? Resize and compress it here.
Frequently asked questions
Is this PDF compressor free?
Yes. Compression runs entirely in your browser and is free to use with no signup.
Are my files uploaded to a server?
No. Your PDF is read, compressed, and rebuilt locally in your browser. It is never sent to KbSnap or any other server.
Can I compress a PDF to exactly 100KB?
KbSnap targets your chosen size on a best-effort basis. Very text-heavy or high-page-count PDFs may not reach an exact target — the actual size is always shown before download.
Does PDF compression reduce quality?
KbSnap first compresses only the images inside your PDF, so text stays sharp and selectable. If the target is still too small, pages are converted into compressed images; text then looks the same but can no longer be selected.
Does the tool work on mobile?
Yes. Tap to upload works on Android and iPhone browsers without needing drag-and-drop.
Helpful guides
- How to Compress a PDF for an Online Application — Why certificate PDFs are too large, how to get them under 100KB, 200KB or 500KB, and how to keep the text readable when a portal has a strict limit.
- How to Scan Documents With Your Phone for Government Forms — Get clean, readable, small scans of certificates, ID cards and marksheets using only your phone — lighting, framing, cropping and file-size tips.
- Bank Exam Uploads: Photo, Signature, Thumb and Declaration — IBPS, SBI and RBI forms ask for four documents: exact sizes, how to write the handwritten declaration, thumb impression rules and mistakes that get rejected.