Fast · Private · Powerful PDF tools
Compress PDFs in seconds.
Shrink PDFs. Keep the quality. Choose from multiple compression presets and compare your PDF's original and compressed file sizes — right in your browser, no signup.
- On-device
- 100% private
- No signup
- Compress now
- Real report
- Before → after
What happens when you add a PDF?
Your file stays on your device. Here's what we do:
Analyze your PDF
We check pages, images, and content to find the best compression method.
Compress in your browser
Your file is processed locally using advanced compression, with no upload required.
Show detailed results
See how much space you saved and what changed.
Download your compressed PDF
Get your smaller file instantly.
Your files never leave your device. All compression runs locally in your browser.
Drop PDFs here or
PDF only · up to 200 MB each on Free · up to 3 files · stays on your device
Your files are private and automatically removed after processing — compression runs in your browser, nothing is uploaded.
Files
No files yet — add a PDF above to see smart analysis and real savings.
Why PDF Compressor
PDF Compressor first, toolbox second.
Pick the right preset
Choose Smart Auto, Maximum, Balanced, or High Quality — then compare the original and compressed sizes in the report.
Smart before you compress
Every file is inspected — text-heavy, scanned, image-heavy, or already optimized — with a recommended preset.
A report, not a mystery
Original, compressed, saved, time, pages, images optimized, and an honest quality note.
Private by architecture
On-device processing means there is nothing to leak, store, or delete late. Privacy policy
All PDF tools
Popular right now
Compress PDF
Shrink PDFs, keep quality
Reduce PDF file size with controllable presets and a full compression report. Private, in-browser processing.
Open toolMerge PDF
Combine PDFs in order
Combine multiple PDFs into one document. Reorder, preview, and download — processed privately in your browser.
Open toolSplit PDF
Split by pages or ranges
Split a PDF into separate files by page ranges or extract selected pages.
Open toolBuilt around compression
Control the tradeoff, don’t guess it.
01 — Presets
Smart Auto · Maximum · Balanced · High Quality
One click, predictable behavior. Balanced is the default because it is right most of the time.
02 — Smart Auto
Smart Auto compression
Automatically selects suitable compression settings based on the PDF.
03 — Batch
Multiple PDFs, individual downloads
Each file tracked independently with its own report. Download each compressed PDF individually.
How it works
Three steps, seconds apart.
Step 1
Add your PDFs
Drag & drop anywhere or browse. Validation, duplicates, and cancellation included.
Step 2
Pick a mode
Balanced for most files, Maximum for the smallest, Smart Auto for an automatic pick.
Step 3
Download + verify
Read the compression report, try stronger if needed, and download each compressed PDF individually.
Made for real deadlines
Job applications
Portals that cap uploads at 5–10 MB. Compress your portfolio so it uploads first try.
Email & forms
Shrink scanned contracts and reports so they send cleanly and upload first try.
Teams & archives
Batch-compress meeting decks and scans, keep quality notes for the record.
FAQ
Straight answers.
What is a PDF compressor?
A PDF compressor is a tool that reduces the file size of a PDF document, making it easier to upload, download, email, and share. PDF Compressor uses compression settings designed to reduce file size while balancing document quality. The amount of reduction depends on the PDF's contents, existing compression, images, and other embedded resources.
Do I need an account to compress a PDF?
No. Open the compressor, select or drag and drop your PDF, choose a compression mode, and process the file. No login, signup, or registration is required.
How do I resize a PDF file size?
To reduce a PDF's file size, open PDF Compressor, select your PDF or drag it into the upload area, choose a compression mode, and start compression. After processing finishes, compare the original and compressed file sizes and download the result if it meets your needs. The final file size depends on the document's contents and the compression settings used.
How to compress PDF to minimum size?
Choose Maximum Compression when your main priority is obtaining a smaller PDF file. This mode may reduce image quality or visual detail. If readability and appearance are more important, try Balanced or High Quality. Smart Auto can select a suitable strategy based on the PDF analysis implemented in the compression engine. Results vary depending on the original document.
Is the PDF compressor free to use?
Yes. PDF Compressor provides free PDF compression with no paid subscription required. Upload or select a PDF, compress it, and download the result.
Will compressing a PDF reduce its quality?
PDF compression can affect quality, depending on the document and compression settings. Maximum Compression prioritizes reducing file size and may reduce image detail. Balanced aims to balance file size and readability, while High Quality prioritizes visual clarity and may produce a larger file. Smart Auto selects an appropriate strategy using the capabilities implemented in the compressor. The actual results depend on the original PDF and the compression engine.
What is the difference between Maximum, Balanced, High Quality, and Smart Auto compression?
Maximum Compression prioritizes reducing file size and may result in lower image quality. Balanced aims to balance file-size reduction with readable text and acceptable visual quality. High Quality prioritizes visual clarity and may result in a smaller reduction in file size. Smart Auto analyzes the PDF using the functionality implemented in the compression engine and selects an appropriate compression strategy automatically. The results depend on the PDF’s contents and the compression settings supported by the engine.
Can I compress multiple PDF files at once?
Yes. Select up to 3 PDF files (up to 200 MB each), choose a compression mode, and process them. Each file has its own processing status, compression report, and downloadable result.
Are my files uploaded anywhere?
No. Compression runs entirely in your browser on your device — nothing is uploaded, nothing is stored on a server, and closing the tab removes everything from memory.
Is there a file size limit? What if my PDF barely shrinks?
The browser compressor handles up to 200 MB per file and 3 files per batch. For larger files, split the PDF first or process in smaller groups. Text-heavy or already-optimized PDFs have little to remove and save less — the report shows the real before/after result, never an invented estimate.