Web app
kompres.org
Kompres is an online PDF compressor that reduces PDF file sizes in the browser. It is aimed at students, office teams, freelancers and operations staff who need smaller documents for email, uploads and archiving.
- Platform
- Web app
- Categories
- AI PDF, AI Documents Assistant
- Indexed
- 2026-10-29
About kompres.org
What is Kompres
Kompres is a free online PDF compressor. According to the page, it can reduce PDF file sizes by up to 90% while maintaining high quality, with no watermark and no registration required. Files are processed in the browser and are not uploaded, and the maximum file size is 50MB.
Users can select a file by clicking or dragging and dropping it, then choose a compression level. The tool displays the original size, the final size and the compression ratio so results can be evaluated before downloading. The page also offers a separate image compressor for JPG, PNG and WebP files and a JPG-to-PDF converter.
Key features
Kompres offers four compression levels: Low, Medium, High and Very High. Low does not re-encode images, while the other levels reduce image quality or resolution using lossy compression. The page notes that size reduction and quality are not guaranteed and depend on the original file.
Processing happens in the browser, so files are not uploaded. After compression, the tool shows the initial size, final size and compression ratio. The output can be downloaded for email, portal uploads and cloud storage. The page also states there is no watermark, no registration and no hidden cost, and that usage is unlimited.
Use cases
The page lists several groups who use Kompres. Students need to upload assignments within file size limits. Office teams send contracts, invoices and monthly reports. Freelancers share proposals and portfolios by email. Operations teams archive many PDFs and want lower storage costs.
Kompres also gives practical guidance: for registration and portals, follow the upload limits and keep required pages plus readable text, stamps and signatures. For email, check the total attachment size or share a download link. For printing and archiving, start with the Low level to preserve images, keep the original file and review the result before choosing stronger compression.
Pricing
Kompres is free to use. The page states that the online PDF compressor is completely free with unlimited usage, no watermark, no registration and no hidden fees. No paid tiers or subscription plans are mentioned on the page.
Questions
kompres.org FAQ
- What is kompres.org?
- kompres.org is an AI tool available as a web app in the AI PDF, AI Documents Assistant categories. Kompres is an online PDF compressor that reduces PDF file sizes in the browser. It is aimed at students, office teams, freelancers and operations staff who need smaller documents for email, uploads and archiving.
- What is kompres.org used for?
- kompres.org is filed under AI PDF, AI Documents Assistant in the AITOOLIST index. Kompres is an online PDF compressor that reduces PDF file sizes in the browser. It is aimed at students, office teams, freelancers and operations staff who need smaller documents for email, uploads and archiving.
- Is kompres.org a web app, an extension or a native app?
- kompres.org is a web app.
Listed in the AITOOLIST index since 2026-10-29.
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