Compress PDF to 300KB

How to Compress PDF

1

Add your PDF

Click “Select files” or drag PDFs in. The 300KB target is already active on this page.

2

Check the target

Keep 300KB for tender and bank portals, or move one rung either way — the row runs from 100KB to 1MB and every option stays live.

3

Compress and download

Click “Compress PDF”. Each file’s before-and-after size is listed, so you can confirm the fit before you upload it anywhere.

Every step runs in your browser. No server uploads, no waiting.

Why use this tool

This page compresses your PDF to 300KB or less. 300KB sits usefully between the strict caps and the comfortable ones: half again the budget of the 200KB standard, which is frequently the difference between a scan that fits at readable quality and one that has to be squeezed soft. Tender portals, bank upload forms and state systems that chose 300KB effectively bought their applicants that margin. The target applies to the whole document — every page stays in, text stays sharp, and the engine finds the highest image quality that still fits. Files already under 300KB get a normal compression pass and typically come out smaller still. If your form specifies a different number, the 200KB and 500KB pages are one click away, and PDF to JPG under 300KB covers forms that want an image per page instead.

When you'd use this

Tender documents

E-procurement portals commonly cap supporting documents at 300KB per file — enough for a stamped, scanned page to stay legible.

Bank form uploads

KYC updates and loan applications where the upload field wants a few hundred kilobytes per document.

ID and certificate scans

A scanned ID card or certificate fits 300KB at a quality the verifying officer can actually read.

Multi-document bundles

When a portal takes five documents at 300KB each, compressing all five in one batch gets the bundle ready in one pass.

Why this matters for your privacy

☁️ CLOUD PDF TOOLS
📄 your-file.pdf
↓ uploaded over the internet
☁️ their server

A copy of your document sits on someone else’s infrastructure — deleted on their schedule, not yours.

✗ OUT OF YOUR HANDS
DukPdf
📄 your-file.pdf
⟳ stays right where it is
💻 your device

Processed by your own browser, start to finish — on your machine, under your control.

✓ STAYS ON YOUR DEVICE

We send the software to your file — not your file to our servers.

Compress PDF — questions

When is 300KB the right target?

When your portal names it, and when 200KB proves too tight for a scan you cannot re-do. The extra hundred kilobytes goes almost entirely to image quality, which is what suffers first under the stricter caps.

Does the whole batch share the 300KB, or each file?

Each file. Ten inputs produce ten outputs, each measured against 300KB on its own. Batch compression exists exactly for the portals that want several small documents rather than one large one.

Why is my scanned PDF harder to compress than my Word export?

A Word export is mostly text and vector data, which compress losslessly and hard. A scan is one large photograph per page — the only way to shrink it is to re-encode the image at lower resolution or quality, which is a real trade the engine makes as gently as the target allows.

Is the compression different from the 200KB page?

Same engine, different budget. Every size page runs the same top-down quality search; the target just decides where it is allowed to stop. There is no separate “300KB algorithm”.

What does compressing cost?

Nothing — no account, no watermark, no file-count meter to buy back. Processing happens on your device, which is also why there is no upload step to wait for.

Tools that pair with compress pdf

→ Merge PDFCombine multiple compressed files→ Protect PDFPassword-protect after compressing→ Edit MetadataStrip authoring metadata to shrink further→ OCR PDFMake scanned PDFs searchable first→ Split PDFExtract and compress specific pages→ Remove PagesDrop pages to reduce size further

Compress PDF for a specific size

→ Compress PDFNo size target — the best quality the page can give.→ Compress PDF to 200KBThe most common upload cap on the web. Government portals, university forms and job sites …→ Compress PDF to 100KBThe strictest cap in common use. Exam registrations and legacy e-forms ask for 100KB when …→ Compress PDF to 500KBThe comfortable ceiling. 500KB fits generous portal limits and keeps multi-page scans look…→ Compress PDF to 1MBThe round number attachment fields ask for. CMS uploads, application systems and shared dr…

Compress PDF guides

→ Compress PDF for emailCompress PDF for email free — fit Gmail (25MB) and Outlook (20MB) attachment limits. No se…→ Compress PDF online freeCompress PDF online free with no server uploads, no watermark. Shrink PDFs in your browser…→ Compress a PDF without uploading itReduce your PDF file size without uploading it anywhere. Compression runs in your browser,…
🔒 DukPdf — YOUR FILES NEVER LEAVE YOUR DEVICE

Ready to compress pdf? Your files stay yours.

No server uploads. No watermark. Just open a tool, drop your files, and download the result. Your original files are never modified.

↑ Back to upload