Compress a PDF on iPhone in Safari — no App Store download, no upload to a server, no account. Pick a target size from 50 KB to 1 MB, the tool iterates through quality tiers and keeps the sharpest version that fits. Works with PDFs from Mail, Messages, Files, and iCloud Drive.
vastiko.com/compress-pdf/. It is a web page, not an App Store download.Honest comparison — where each option wins on iPhone and where it falls short.
Built in. Open a PDF in Files, tap Share > Print, pinch outward on the preview to "export as PDF". Creates a new PDF but does not meaningfully reduce size — often the new file is the same or larger than the original. Not a real compressor.
Free app with Compress PDF feature, but requires sign-in and uploads files to Adobe Document Cloud. Compression is aggressive — one fixed level, no target. Fine for occasional use if you already have Adobe; heavy for a one-off.
Paid native apps with local compression. Good if you use them daily. Not worth installing for a single compression.
Free tiers, but they upload your PDF to their servers. Privacy concerns for confidential documents. Ad-supported in the free tier.
Browser-based, local compression with target-size control. Free, no app install, no signup, no watermark. File never leaves Safari. The right choice when you need to hit a specific size for a government portal or email.
For daily batch workflows or OCR of scanned PDFs, a paid iOS app has more features. For hitting a size target in one pass, the browser tool is simpler.
| iOS version | iOS 16 or newer (works on iOS 15 with slightly slower performance) |
|---|---|
| Browser | Safari (preferred), or Chrome / Edge / Firefox on iOS |
| Storage | ~3× the PDF size free, temporarily — a 10 MB PDF wants 30 MB free during compression |
| Install needed | None — it is a web page |
| Account needed | None |
| Source file | Files, iCloud Drive, Mail, Messages, Google Drive, Dropbox — any iOS file picker source |
| Max file size | Practical ceiling ~80 MB source PDF on iPhone 12 and newer; older iPhones want under 30 MB |
Tap the zone below to pick a PDF. Works entirely in Safari.
Open the PDF compressor on iPhone
100% private — file never leaves Safari.
No. The tool is a web page — open Safari, go to vastiko.com/compress-pdf/, tap the upload zone, and pick your PDF from Files, iCloud Drive, Mail, or Messages. Nothing from the App Store. Runs on any iPhone with iOS 16 or later.
Print-to-PDF on iOS (pinch out on the preview in the print sheet) makes a new PDF from a print preview — it often keeps roughly the same size as the original, sometimes larger, because iOS re-renders fonts and images at high quality. It is not a compressor. For actual size reduction you need a tool that re-encodes pages.
Safari prompts you to download the file to Files. Pick iCloud Drive, On My iPhone, or a cloud service. From Files you can AirDrop, email, attach to a message, or upload to a portal.
Yes. Tap and hold the attachment, choose 'Save to Files', then open Safari and drop the saved PDF on the upload zone. Alternatively tap Share, scroll to 'Open in…' and pick Safari directly. Both flows take three taps.
No. Compression runs in Safari's JavaScript memory. pdf.js and pdf-lib handle everything locally. Your bank statement, contract, or medical PDF never leaves the device. Close the Safari tab and nothing is retained.
Compress PDF on Mac
Preview vs browser tool
Compress PDF on Windows
No Acrobat needed
Compress to 50 KB
Most aggressive preset
Compress to 100 KB
Common e-form cap
Compress to 200 KB
DS-160 & PAN upload
Compress to 300 KB
Passport Seva & exam portals
Compress to 1 MB
Email attachment friendly
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