Compress PDF to 5 MB
Hit the WhatsApp document sweet spot and Turnitin / Moodle upload cap. Entirely in your browser.
Drop files here
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Accepts .PDF · Up to 1,000 files
How it works
Drop your files
Drag and drop, click to browse, or paste from clipboard. Up to 1,000 files at once.
Choose settings
Adjust quality, format, and other options to match your needs.
Click Convert
Everything runs in your browser via WebAssembly. Compress PDF happens locally — no server involved.
Download
Download files individually or grab all at once as a ZIP.
5 MB is the WhatsApp document attachment sweet spot — the app allows up to 100 MB, but files above 5 MB load slowly on mobile data and are often abandoned by recipients before they open. It's also the most common upload limit for academic platforms: Turnitin caps individual file submissions at 5 MB, and Moodle's default assignment upload limit is 5 MB. The compressor targets 4.5–5 MB, giving room to breathe so your file opens cleanly on every platform.
When you need 5 MB
- WhatsApp document sharing
Documents sent over WhatsApp Business and personal chats load fastest under 5 MB — larger files often appear as undownloaded for recipients on limited mobile data.
- Turnitin assignment submissions
Turnitin's plagiarism checker enforces a hard 5 MB per-file limit. Submissions over 5 MB are rejected at upload.
- Moodle LMS assignment uploads
Moodle's default max_upload_size is 5 MB in most institutional deployments. Students on underconfigured portals hit this limit frequently.
- Email attachments without file-size warnings
Gmail and Outlook mobile clients show a size warning above 5 MB before sending. Staying under 5 MB avoids the warning and keeps attachments opening quickly on mobile.
- Cloud storage links shared in group chats
Files shared as Google Drive or OneDrive links in group chats are expected to be under 5 MB by convention — larger files should use cloud storage, not direct attachment.
Frequently asked questions
Turnitin measures exact byte count. Some file viewers round or display megabytes differently. Verify your exact file size in your OS's file properties (right-click → Get Info on macOS; Properties on Windows). The compressor here targets 5,000 KB (5,120,000 bytes), safely under Turnitin's 5 MB limit.
Yes — the 5 MB target is a safe default. If your Moodle instance allows 10 MB or 20 MB, you don't need to compress below 5 MB. Check your assignment upload screen for the maximum file size shown there.
Possibly. WhatsApp downloads documents in the background on WiFi and pauses on mobile data. Files between 5–25 MB download but open slowly; files above 25 MB are blocked on some devices. Compressing to 5 MB ensures the document downloads and opens on all network conditions.
No. The tool cannot read encrypted PDFs. Remove the password first using the Unlock PDF tool, then compress.
Target-size mode runs up to six compression passes automatically — structural cleanup, then progressively lower JPEG quality (80 → 60 → 40 → 30%) — stopping as soon as your size target is met. The slider applies a single fixed pass. Use target-size mode when you have a hard limit (email attachment ceiling, government portal cap).