Mozjpeg encoding, not a generic encoder
Mozjpeg reliably produces smaller files than typical JPEG encoders at the same visual quality, so you lose less detail per kilobyte saved.
Compress JPG
Compress JPG online for free with adjustable quality and mozjpeg encoding. Reduce photo file size while keeping detail, with secure uploads and no signup.
- Mozjpeg encoding, not a generic encoder
- Fast, server-side compression
- Encrypted upload, automatic cleanup
- Free to start
Choose your file
Drop files here or click to upload
JPG, JPEG· up to 20.0 MB per file
Files are private and deleted after conversion
Anonymous files: 20 MB. Free accounts: 50 MB and batches of 5. Paid accounts: 200 MB and batches of 100.
Why use this Compress JPG?
Compress JPG online for free with adjustable quality and mozjpeg encoding. Reduce photo file size while keeping detail, with secure uploads and no signup.
Fast, server-side compression
Typical photos compress in a few seconds. Paid accounts can also compress up to 100 JPGs in one batch and download a single ZIP.
Encrypted upload, automatic cleanup
Uploads travel over HTTPS, and both the original and the compressed JPG are deleted automatically within 24 hours.
Free to start
Anonymous visitors get 1 free server-side compression, and free accounts receive 3 conversions every 30 days.
How to use the Compress JPG
- 01
Upload your JPG
Choose the JPG photo you want to shrink — screenshots, camera photos and scans all work.
- 02
Set your quality
Pick a value from 1–100 (default 80). 80–90 suits photos you may print or edit again; 60–75 is plenty for web and messaging.
- 03
The server compresses with mozjpeg
Re-encoding uses the mozjpeg encoder, which squeezes JPGs harder than most standard encoders at the same visual quality.
- 04
Download the smaller JPG
Save the compressed file — it stays a standard JPG, ready to share, email or upload wherever you need it.
Best source settings for the Compress JPG
Choose settings that match the result you need.
↔ Swipe sideways to view every column.
| Need | Recommended setting | Best for |
|---|---|---|
| Quality (default 80) | Compression uses the mozjpeg encoder, which squeezes JPGs harder than most tools at the same visual quality. Keep 80–90 for photos you may edit or print again; 60–75 is usually enough for web pages and messaging. The lower the value, the more visible the artifacts around edges and text become. | Compression uses the mozjpeg encoder, which squeezes JPGs harder than most tools at the same visual quality. Keep 80–90 for photos you may edit or print again; 60–75 is usually enough for web pages and messaging. The lower the value, the more visible the artifacts around edges and text become. |
- Upload your JPG
- Choose the JPG photo you want to shrink — screenshots, camera photos and scans all work.
- Set your quality
- Pick a value from 1–100 (default 80). 80–90 suits photos you may print or edit again; 60–75 is plenty for web and messaging.
Compress JPG input and output
Review what the tool accepts, how it processes the file, and what it produces.
↔ Swipe sideways to view every column.
| Feature | JPG | JPG |
|---|---|---|
| Format | JPG | JPG |
| Processing | Secure cloud processing | Secure cloud processing |
| Result | Compress JPG online for free with adjustable quality and mozjpeg encoding. Reduce photo file size while keeping detail, with secure uploads and no signup. | Compress JPG online for free with adjustable quality and mozjpeg encoding. Reduce photo file size while keeping detail, with secure uploads and no signup. |
Where to use files from the Compress JPG
The output is ready for common workflows supported by its format.
- Mozjpeg encoding, not a generic encoder
- Mozjpeg reliably produces smaller files than typical JPEG encoders at the same visual quality, so you lose less detail per kilobyte saved.
- Fast, server-side compression
- Typical photos compress in a few seconds. Paid accounts can also compress up to 100 JPGs in one batch and download a single ZIP.
- Encrypted upload, automatic cleanup
- Uploads travel over HTTPS, and both the original and the compressed JPG are deleted automatically within 24 hours.
- Free to start
- Anonymous visitors get 1 free server-side compression, and free accounts receive 3 conversions every 30 days.
About the formats
JPG
JPG (also written JPEG) is the most widely used lossy image format for photographs, standardized by the Joint Photographic Experts Group in 1992. Practically every camera, phone, and image application can create and open it.
Its strengths are small file sizes for photos and universal compatibility across devices, browsers, and software. The trade-offs: lossy compression introduces artifacts, there is no transparency support, and quality degrades a little more with every re-save. Use JPG for photographs; choose PNG for screenshots, logos, or anything that needs sharp edges or transparency.
Privacy and file handling
This tool uses secure cloud processing for formats or operations browsers cannot handle reliably.
- Secure transfer
- Files are transferred over HTTPS and used only for the requested operation.
- Automatic deletion
- Inputs are removed within 6–24 hours and generated outputs within 24 hours.
- Private downloads
- Results are delivered with expiring signed download links.
Compress JPG troubleshooting
- I see blocky artifacts or halos around text and edges
- The quality is set too low for content with sharp edges. Raise it to 85 or higher; and if the image is a screenshot or a graphic with text, JPG is a poor fit — convert it to PNG or WebP with the Image Converter instead.
- The file got bigger after compressing
- This happens when the source JPG was already saved at a quality lower than the one you chose — re-encoding at a higher quality adds data without adding detail. Pick a quality at or below the original, or simply keep the original file.
- Every time I compress the photo again it looks worse
- JPG is a lossy format, so every re-save discards a little more detail (generation loss). Always compress starting from the original photo rather than from an earlier compressed copy, and keep an untouched master version.
FAQ
- How much smaller will my JPG be?
- It depends on the original, but lowering the quality setting typically reduces file size by 40–70% with little visible difference.
- Is the conversion private?
- Yes. Your files are processed securely and deleted after conversion. We never share your photos.
- Is there a file size limit?
- Free accounts can upload files up to 50 MB. Paid users can upload up to 200 MB.
- What encoder do you use to compress?
- Compression uses the mozjpeg encoder, which squeezes JPGs harder than most tools at the same visual quality.
- Why does my compressed JPG show artifacts around text or edges?
- The quality is set too low for content with sharp edges. Raise it to 85 or higher; if the image is a screenshot or graphic with text, convert it to PNG or WebP instead.
- Why did the file get bigger after compressing?
- This happens when the source JPG was already saved at a quality lower than the one you chose — re-encoding at a higher quality adds data without adding detail. Pick a quality at or below the original.
- Can I compress multiple JPGs at once?
- Signed-in users can batch-compress up to 5 files on the free plan and up to 100 on a paid plan, downloaded together as a ZIP.
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Compress JPG online for free with adjustable quality and mozjpeg encoding. Reduce photo file size while keeping detail, with secure uploads and no signup.
Compress JPG