Compress a PDF to 100KB, 200KB, or email size
Hit 100KB or 200KB for form uploads, or stay under 10MB / Gmail’s 25MB for email. Multi-pass compression runs in this browser — the file is never uploaded.
Compress PDF & Images
Reduce file size of PDFs, JPGs, PNGs to your exact target (KB/MB).
Drop your PDF or Images here
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About Convertify PDF Compressor
Compress a PDF to 50KB, 100KB or 200KB for government and visa uploads, or under 10MB / Gmail’s 25MB attachment cap. Multi-pass, no watermark, no sign-up. Files stay in your browser.
Why Use Convertify's Convertify PDF Compressor?
Hit Exact Size
Target 100KB, 200KB or any custom limit
Local Compression
PDF.js renders pages without uploading
Multi-Pass Engine
Auto-tunes quality + DPI to your target
Forms-Ready
Built for visa portals and gov.uk uploads
Common Use Cases
- 1Compressing PDFs to 100KB or 200KB for government form uploads
- 2Getting a scan under Gmail’s 25MB limit or a 10MB office cap
- 3Reducing passport and visa supporting documents for portal uploads
- 4Making a job or university application PDF small enough to attach
- 5Shrinking a scan that was rejected as too large, without an account
Convertify processes all files directly in your browser — nothing is uploaded to any server. Your documents stay private and secure on your device at all times.
The complete guide to PDF Compressor
Last updated May 8, 2026Compressing a PDF to a specific KB target — 100 KB, 200 KB, 500 KB — is one of those small problems that gets surprisingly hard to solve well. Government forms, university applications, and visa portals enforce strict size caps, and most online compressors give you three vague choices ("low", "medium", "high") that rarely hit the number you actually need.
Convertify's PDF compressor takes a target-size-first approach. You type the limit (e.g. 100 KB), and the compressor uses a multi-pass engine to auto-tune both DPI and JPEG quality until the output is at or below your number. It runs entirely in your browser using PDF.js for rendering and PDF-Lib for re-assembly — your document never touches a server.
If you came here because a portal rejected your upload ("file must be under 200 KB"), you're in the right place. The result is a real PDF, not a flattened image, and text remains selectable when the source was a text PDF.
How PDF Compressor on Convertify compares
| Feature | Convertify | Typical online tool |
|---|---|---|
| Hit exact KB target | Yes (preset + custom) | Vague "low/medium/high" |
| Files uploaded | Never | Yes |
| Free tier daily limit | Unlimited | 1–3 compressions |
| Quality slider | 10–100% | Locked on free |
| Resolution control | 0.5×–2.0× | None |
| Multi-pass tuning | Auto-targets exact size | Single pass |
| Watermark | None | Often added |
Step-by-step: how to use PDF Compressor
- 1
Drop the PDF you want to shrink
Drag a single PDF or any common image (JPG, PNG, WebP) into the upload zone. The current file size is shown so you can see how aggressive a target you'll need.
- 2
Pick a size target
Use the preset chips (50 KB, 100 KB, 200 KB, 500 KB, 1 MB, 2 MB, 5 MB, 10 MB) or type a custom number with KB / MB toggle. Convertify warns you if your target is larger than the current file.
- 3
Optional: tune quality manually
Open Advanced Settings to override the auto-picked quality (10–100%) and resolution scale (0.5×–2.0×). This is useful when text sharpness matters more than file size — e.g. compressing a contract you'll print versus compressing a receipt you'll only view on screen.
- 4
Click Compress
The compressor renders each page through PDF.js, encodes it as JPEG at the chosen quality, and rebuilds a new PDF with PDF-Lib. For a typical 5–20 MB document this completes in 5–15 seconds. Larger PDFs scale roughly with page count.
- 5
Verify and download
The result screen shows old size → new size and whether the target was hit. If you missed the target, lower the quality slider and re-run; the auto-tuner gets you within 5% on most inputs.
Real-world scenarios
US visa applications (DS-160, I-130) — under 240 KB
The Department of State's CEAC portal limits supporting document uploads to 240 KB. Set the Convertify target to 200 KB to leave headroom and run your scanned passport, marriage certificate, or financial proof through. Because compression happens locally, your personal documents never leave your device — important when you're handling biometric or financial proof.
Indian government forms (UPSC, SSC, banking exams) — 100/200/500 KB
Indian recruitment portals are notorious for strict size caps: photo under 50 KB, signature under 30 KB, ID proof under 100 KB, education certificate under 500 KB. The presets in Convertify map directly to the common limits, and the exact-target mode means you don't get rejected for being over by a few KB.
UK passport / NHS forms — under 1 MB
GOV.UK and NHS forms typically cap supporting documents at 1 MB. Compress to 800 KB to leave margin for any portal-side overhead, and keep text mode in advanced settings if the document has fine print that needs to remain readable.
Email attachments — under Gmail's 25 MB limit
Gmail rejects attachments over 25 MB. For a 35-50 MB scanned brief or design deck, set the target to 20 MB and let the compressor reduce DPI on image-heavy pages. The final PDF still opens cleanly in any reader.
WhatsApp / Telegram sharing — under 16 MB
WhatsApp's document share caps at 100 MB but quality degrades over 16 MB; Telegram is similar. Use the 10 MB or 5 MB preset for fast share-and-forward without quality complaints from recipients.
Troubleshooting and edge cases
I set a target of 100 KB and got 130 KB — why?⌄
Auto-tuning gets close on most files but can't always hit aggressive targets without making text unreadable. Open Advanced and drop quality to 30-40% and resolution scale to 0.7×. If the source PDF is mostly photos (a passport scan) you can usually go to 100 KB; if it's a 10-page text document, 100 KB requires very aggressive settings.
The compressed PDF text is no longer selectable.⌄
Convertify's compressor rasterizes pages — each page becomes a JPEG embedded in a new PDF — so text is no longer searchable. This is the trade-off for hitting tight size targets. If you need selectable text, use a less aggressive setting and accept a larger output, or run OCR after compression with the OCR PDF tool.
My scan is unreadable after compression.⌄
Scans of small text (e.g. ID cards) are particularly sensitive. Try 60% quality with 1.0× resolution first — that usually preserves legibility while still cutting size by 40-60%.
Why does compressing a small PDF make it bigger?⌄
If your source PDF is already optimized (e.g. a digitally generated text-only PDF under 200 KB), the rasterize-and-re-encode flow can produce a larger file because it's now an image-based PDF. The result screen warns you when this happens; in that case the original is already as small as it'll get.
How to Compress PDF Files with Convertify - Step by Step Guide
Upload PDF
Drop a PDF (or a photo). The current size is shown so you can pick a realistic target.
Choose a target
Use 100 KB / 200 KB for forms, 10 MB for email, or type a custom KB or MB value.
Download
Get the smaller PDF on your device — no watermark, no sign-up, no upload.
Frequently Asked Questions about Convertify PDF Compressor
How do I compress a PDF to 100KB or 200KB for a government or visa form?
How do I compress a PDF for Gmail or an email attachment under 10MB?
The file is still too large after compression. What now?
Will the text stay selectable?
Does compressing a PDF upload my file?
JPEG vs a “real” PDF — will the portal accept it?
Same job, next step
These four tools stay on your device. Use them together when a form cares about pixels, kilobytes, and a plain background.
Guides: compress for forms and email
How to Compress PDF for Email - Beat the 25MB Gmail Limit
PDF too large for email? Learn how to reduce PDF size to fit Gmail, Outlook, and other email services.
How to Reduce PDF Size Without Losing Quality - Ultimate Guide
Learn how to reduce PDF file size while maintaining quality. Compress PDF files losslessly with our free online tool. No quality loss, 100% free compression.
How to Compress a PDF to Under 500KB (Without It Turning to Mush)
500KB is the most common upload cap on job portals and application forms. Here's how to hit it reliably, and what to do when a file refuses to go below it.
Compressing PDFs for a Visa Application: Size Limits and What Not to Break
Visa portals have some of the strictest upload limits on the internet, and the worst error messages. Here's how to hit the size without damaging the documents an officer has to read.