Image Compressor Guide — Reduce JPG & PNG Size
Compress images for web, email, and PDF workflows. Quality trade-offs and when to compress after background removal.
Published June 1, 2025 · 1 min read
3 uses per day · 200 MB · TLS encrypted · auto-delete
Compress images for web and email
Large JPG and PNG files slow websites and bounce email attachments. RatPDF's image compressor reduces file size while keeping acceptable visual quality for listings, blogs, and chat apps.
When to compress
- Product photos before uploading to Shopify or marketplaces
- Screenshot attachments under email limits
- Hero images before adding to a PDF via Image to PDF
Need transparent backgrounds? Use our browser-based background remover first, then compress the PNG.
3 uses per day · 200 MB · TLS encrypted · auto-delete
Frequently asked questions
How do I compress a PDF online?
Open Compress PDF, upload your file, choose a level, and download the smaller PDF.
Which compression level should I use?
Recommended (Medium) for most email; Low for legal scans; High only when portals still reject the file.
Will compression remove text from my PDF?
No — text stays as vectors; embedded images are re-encoded to reduce file size.
Sources & references
Primary references used when researching and fact-checking this guide. See our editorial methodology.
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Adobe PDF Reference — encryption
— Adobe
PDF password protection and encryption standards (ISO 32000). -
Ghostscript documentation — PDF settings
— Artifex Software
Compression level behavior and PDF output settings.