What are the best free AI tools?

OpenDesk offers 127 free AI tools including an AI slides maker, AI resume builder, PDF tools, image generator, code agent, SEO and writing tools.

Is there a free AI tool to create presentations?

Yes — OpenDesk's AI Slides Maker generates full presentations from a prompt for free.

What is the best free AI tool for coding?

OpenDesk's AI Code Agent generates, refactors and explains code across major languages, free to start.

Are SEO AI tools free?

OpenDesk includes 10 free AI-powered SEO tools for keyword ideas, meta tags, content briefs and on-page audits.

Yes — 5 generations per tool per day with no signup. Create a free account for unlimited generations, saved history, and cross-device sync. Paid plans unlock team workspaces, priority queue, and API access.

What output format do I get?

Plain text, formatted for readability. Copy, download, or share via link.

Where does my data go?

Compress PDF runs 100% client-side using your browser's compute. Files and text never leave your device — safe for confidential material.

Can I share my output?

Yes — click *Share Setup* to copy a deep link that pre-fills the same inputs for the next person. Output itself can be copied, downloaded, or printed to PDF.

What if I hit the free limit?

Sign in (free) for unlimited generations on every tool. Or check /tools — over 120 tools cover the same task in different ways.

All Tools

Compress PDF

PDF Master Suite

Compress PDF files to reduce size while maintaining quality. Perfect for email attachments.

100% Private — runs in your browser No signup for first 3 files

Free tier: 0/3 files used (rolling 30 days)3 left

Upload file

Drop file here or click to upload

PDF files

Compression Level

Result

Upload a file and click Process.

Files never leave your device. Powered by browser-native processing.

What Compress PDF does differently

Produces a ready-to-download file for compress pdf.
Runs 100% in your browser with pdf-lib — your compress PDF job never touches a server.
Controls: Upload PDF · Compression Level — each one changes the result meaningfully.
Batch-friendly: queue several documents and process them in a single pass.
Keeps page dimensions, embedded fonts and annotations byte-accurate.

Technical spec

RuntimeIn-browser (WASM)

PrivacyFiles never uploaded

OutputDownloadable file

Typical time< 3s per file

PDF Tools

Pairs well with

Merge PDFCombine multiple PDF files into one

Split PDFSeparate PDF into multiple files

Remove PagesDelete specific pages from PDF

Extract PagesPull out specific pages from PDF

Organize PDFReorder PDF pages

Scan to PDFConvert scanned images to PDF

How to use Compress PDF

1
Open the tool
Go to Compress PDF — no signup required for your first 5 generations per tool. Sign in for unlimited use, saved history, and team sharing.
2
Fill in 1 required field
The required input is Upload PDF. Click Try Example to autofill realistic sample data.
3
Tune optional settings
Refine the output with Compression Level. Selectors offer curated presets that match common use cases.
4
Generate
The output is computed instantly in your browser — nothing is uploaded to a server.
5
Export & share
Copy, download (.txt), print to PDF, or hit Share Setup to send a pre-filled link to a teammate. Last 10 generations are saved locally; sign in to sync across devices.

Pro tips

Be specific in your inputs — vague prompts produce vague output. For Compress PDF, naming concrete numbers, brand names, or constraints lifts quality dramatically.
Because Compress PDF runs entirely in your browser, your data never leaves your device. Safe to use with confidential material.
Combine Compress PDF with other OpenDesk tools — chain output into Writer Studio, SEO Studio, or Open Pilot for richer workflows.

Technical FAQ

More PDF Master Suite

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