Free Image Compressor Online
Compress JPG, PNG, WebP, AVIF and HEIC images by up to 90% — free, no watermark, no sign-up and no upload to any server. Everything runs in your browser instantly.
🗜️ Drag & drop images here
or click to browse files
JPG · PNG · WebP · HEIC supported · Up to 20 images · No sign-up required
Compressed Files
100% Private — No Upload
All compression happens entirely in your browser. Your images never touch any server, are never stored and are never shared — not even temporarily.
Instant Results
No waiting for server processing. Compression runs in seconds directly on your device — works on Windows, Mac, iPhone and Android.
Batch Compress Free
Compress up to 20 images at once with no watermarks and no sign-up. Each result shows the exact file size saving as a percentage.
How to Compress Images Online — 4 Simple Steps
Compressing images with FreeConverto takes under 30 seconds. No sign-up, no watermarks — your images never leave your device. Everything runs in your browser with no software to install.
Upload Images
Drag and drop up to 20 images or click to browse. JPG, PNG, WebP and HEIC from iPhone are all supported.
Set Quality
Drag the quality slider — 70–80% gives the best balance of file size and quality for most images. Lower = smaller file.
Choose Format
Keep the original format or convert to WebP or AVIF at the same time for even smaller files with no extra steps.
Download Free
Click Compress Images. Download one by one or all as a ZIP. No watermarks added, no sign-up required — ever.
Which Format Gives the Smallest File Size?
The output format has a bigger impact on file size than quality settings alone. Here is how the main formats compare when compressing the same image at equivalent visual quality — choose the right one before you compress.
Smallest — best for modern web
40–50% smaller than JPG at the same quality. Uses AV1 codec compression — the most efficient format available for websites where speed is the priority.
Excellent size & quality balance
25–35% smaller than JPG with excellent browser support across all modern browsers — the most practical choice for web images and social media.
Standard universal format
The most universally supported format. Best for photos, email attachments and any situation requiring compatibility with older software and every device.
Lossless — no quality loss
Cannot be meaningfully compressed with a quality slider. Larger than JPG for photos — best kept for logos, screenshots and graphics needing transparency.
Frequently Asked Questions
How much can I reduce image file size?
Typically 50–90% depending on the original image and quality setting. JPG images at 75% quality usually achieve 60–80% reduction with no visible difference. Switching to WebP or AVIF reduces file size even further at the same quality level — without any extra steps.
How do I compress images for email without losing quality?
Upload your images, set the quality slider to 75–80% and keep the format as JPG. This reduces file size by 60–80% while keeping images sharp enough for email. For multiple images, compress all 20 at once and download them as a single ZIP file — free, no watermark, no sign-up.
How do I reduce image file size for Instagram without a watermark?
Upload your JPG or PNG, set quality to 80% and select WebP as the output format. WebP files are 25–35% smaller than JPG at the same quality and are fully supported by Instagram. Download the compressed file with no watermark added — completely free.
What is the best quality setting for web images?
70–80% quality is the sweet spot for most web images — significantly smaller file size with no visible quality loss. Use 85–90% for photography portfolios or product images where fine detail is important. For WebP or AVIF output, 70–75% gives even better compression than JPG at 80%.
Can I compress PNG images without losing quality?
PNG is lossless so the quality slider has limited effect. The best approach is to switch the output format to WebP — WebP supports lossless compression with transparency and produces much smaller files than PNG. Use our dedicated image converter for full PNG format control.
Can I compress HEIC photos from my iPhone?
Yes — upload your HEIC files directly. They are decoded in your browser using the heic2any library and compressed to JPG or WebP. Note that HEIC decoding takes a few seconds per file because HEIC uses the H.265 codec which is complex to process in a browser. This is normal and not a bug.
Does compressing an image reduce its dimensions?
No — compression only reduces the file size. The image width and height stay exactly the same. Use our image resizer if you need to change the pixel dimensions, or our image cropper to trim to a specific ratio.
Is this image compressor completely free?
Yes — completely free with no usage limits, no watermarks and no account required. You can also convert images to a different format, resize images or use any of our 13 free image tools — all free, all in your browser.