Compress PDF Online Free
Reduce PDF file size by 40-70% with real image recompression. Choose your quality level. Free, instant, and 100% private.
How PDF Compression Works
PDF compression reduces file size by re-encoding images embedded in the document at lower resolution or higher compression ratios, removing duplicate resources, and stripping unnecessary metadata. Toolkiya performs all of this processing inside your browser — the PDF never leaves your device.
The compression algorithm targets the largest contributors to file size first: high-resolution images are re-sampled to screen-friendly resolutions (150-200 DPI instead of 300+ DPI), and JPEG quality is adjusted to balance visual quality against size. Text, vector graphics, and fonts remain untouched so your document stays sharp and readable.
When to Compress PDFs
Reducing PDF size to meet email attachment limits (typically 10-25 MB). Compressing scanned documents that are unnecessarily large due to high-DPI scanning. Preparing files for web upload where smaller sizes mean faster loading. Shrinking presentation decks with embedded images for easier sharing. Meeting government or institutional form submission size requirements.
Why Compress PDFs with Toolkiya
Server-based compressors like iLovePDF and SmallPDF upload your documents to their cloud, creating a copy of your file on infrastructure you do not control. For sensitive documents — tax returns, contracts, medical records — this is an unnecessary risk. Toolkiya compresses entirely in your browser.
There is no limit on how many PDFs you can compress per day, no watermark added to the output, and no signup required. The tool is completely free and works on every platform.
Frequently Asked Questions
How much can I compress a PDF with this tool?▼
With aggressive compression, image-heavy PDFs typically shrink 40-70%. Text-heavy PDFs see 15-30% reduction. Scanned documents (which are essentially images) compress the most — often 50-60%. Use the quality slider to find the right balance between file size and visual quality for your use case.
What's the difference between the compression modes?▼
Lossless mode removes unused objects and optimizes the PDF structure without touching images — safe for any document but gives modest 5-15% reduction. Low/Medium/High compression re-encodes embedded images at lower quality using JPEG compression — this gives much bigger reductions (20-70%) but images will lose some sharpness. Text-only PDFs compress about the same in all modes.
Will compression reduce image or text quality?▼
In Lossless mode, everything is preserved exactly. In the compression modes (Low/Medium/High), embedded images are re-encoded as JPEG at the chosen quality level. Text and vector graphics in the PDF are rasterized during compression — this means text in the output is an image, not selectable. If you need selectable text, use Lossless mode or our OCR tool after compression.
Is there a file size limit?▼
Each PDF can be up to 50MB. Compression runs entirely in your browser's memory using pdfjs-dist for rendering and pdf-lib for the output. Larger files may be slow on older devices.
Why compress to 100KB, 200KB, or 1MB?▼
Government portals and bank KYC systems often enforce strict file size limits — Indian passport applications cap at 300KB, Aadhaar enrollment needs under 100KB, and many exam sites limit to 1MB. Use High compression with 150 DPI to hit these targets on image-heavy documents.
Does this tool upload my PDF to a server?▼
No. Your PDF never leaves your browser. Toolkiya uses pdfjs-dist to render pages and pdf-lib to rebuild the output — all in JavaScript memory. Safe for contracts, medical records, financial statements, passport scans, and any sensitive document.
Can I compress scanned PDFs effectively?▼
Yes — scanned PDFs are where this tool shines most. Since scanned pages are essentially images, the JPEG recompression in Medium or High mode can cut file size by 50-70%. A 10MB scanned document often compresses to 2-3MB at Medium quality with no visible difference on screen.
What if the compressed file is larger than the original?▼
This can happen in Lossless mode with already-optimized PDFs. In compression modes, the output is always smaller because images are re-encoded at lower quality. If Lossless gives you a larger file, switch to Low compression for guaranteed reduction.
Will the compressed PDF still open in Adobe Acrobat?▼
Yes. The output is a standard PDF 1.7 file that opens in Adobe Acrobat, Preview, Foxit, Chrome, Firefox, and any other PDF reader. All pages are preserved in order.
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Built & maintained by Mayank Rai
Solo developer based in Lucknow, India