Image Compressor

About this tool

Phone cameras produce 8 MB photos that take six seconds to load on 4G. Oversized images are the fastest fix for slow pages and bounced email attachments. This tool sends your JPEG, PNG, WebP or AVIF to our server, where Sharp re-encodes it at the quality you choose (1 to 100, default 80) and keeps the original format: JPEG stays JPEG, PNG stays PNG, WebP stays WebP and AVIF stays AVIF. PNGs are reduced to an optimised colour palette, which shrinks them while keeping transparency. The result shows the original size, compressed size and percentage saved, with a drag-to-compare slider, side-by-side view and single-image views so you can check quality before downloading. If re-encoding would make the file bigger, the tool warns you and offers the original instead. EXIF and GPS metadata are dropped during re-encoding. Files up to 20 MB are accepted and deleted from the server as soon as the result is returned. No account, no watermark, and no daily quota.

Why use it

• Large File Size Reductions: Re-encoding a high-quality camera JPEG at quality 75 to 80 often cuts its size by more than half with no visible difference at normal viewing distance. The Saved percentage shows exactly how much you gained.

• Quality Slider 1–100: Default 80 is the web sweet spot — drop to 70 for thumbnails or 90 for full-bleed hero images. Visual difference is barely perceptible above quality 75, while file size differences between 75 and 95 are often greater than 50%.

• Same Format In, Same Format Out: JPEG, PNG, WebP and AVIF each go through Sharp's matching encoder, so your file never silently changes type. PNGs are quantised to an optimised palette, which keeps the alpha channel while trimming bytes.

• Visual Before/After Check: A draggable comparison slider, a side-by-side view and single-image views let you spot artefacts before you download rather than after you publish. If the output would be larger than the source, you are warned and offered the original.

• Auto-Deleted After Processing: Files are processed inside a temporary directory on the backend and deleted within seconds of returning the result. There is no storage bucket, no analytics on your images, and no third-party CDN receiving your photos.

• No Quota, No Watermarks: Compress 100 product photos back-to-back without hitting a daily cap or a watermark prompt. No account is required, and the tool never adds a visible or invisible overlay to your output images.

How to use

1. Drop a JPEG, PNG, WebP or AVIF file (up to 20 MB) onto the upload area or click to browse
2. Drag the Quality slider between 1 and 100; the default of 80 suits most web photos
3. Click Compress Image; the file is re-encoded on the server in its original format
4. Read the Original, Compressed and Saved figures above the preview
5. Switch between Slider, Side-by-side, Original only and Compressed only to inspect quality
6. Click Download Compressed to save the smaller file

When it helps

• Before uploading product photos to Shopify, WooCommerce, or any ecommerce platform that serves images byte-for-byte
• When a blog post scores a poor Lighthouse score because hero images exceed 500 KB
• Before emailing a batch of event or real-estate photos that bounce off a 25 MB attachment limit
• Before pushing design assets to a GitHub repo where large binaries inflate clone times
• When a web form rejects an image upload because the file exceeds its size limit
• Before attaching screenshots to a bug report or support ticket in a project management tool

Examples

Tips

• Quality 75 is the web sweet spot — most viewers cannot tell the difference compared to quality 95, and the file is typically 60% smaller.
• For photos, JPEG and WebP both use lossy compression. For screenshots and logos with text, use PNG or lossless WebP to keep edges crisp.
• If you plan to crop or edit further, compress only after the final edit — re-encoding a lossy format multiple times compounds quality loss each time.
• WebP saves roughly 30% over JPEG at the same visual quality but is not fully supported in older email clients — safe for web, risky for email newsletters.
• Run images through this tool before uploading to a CMS. Most content management systems serve the original byte-for-byte without optimising on their end.

Frequently Asked Questions

Glossary

Quality factor

A 1–100 integer that controls how aggressively lossy encoders discard visual data. Higher values preserve more detail but produce larger files; values below 75 begin to show visible artefacts in most photos.

mozjpeg

An open-source JPEG encoder maintained by Mozilla that applies additional optimisation passes beyond the baseline JPEG standard, achieving 10–15% smaller files at equivalent visual quality compared to libjpeg.

Lossy vs lossless

Lossy compression permanently discards imperceptible data to achieve large file reductions; decoded pixels differ slightly from the source. Lossless compression reorganises data without any information loss, producing identical pixels on decode.

Progressive JPEG

A JPEG encoding mode that stores the image in multiple low-to-high frequency passes. Browsers can render a blurry preview before the full file loads, improving perceived performance on slow connections.

Chroma subsampling

A JPEG and WebP encoding technique that stores colour (chroma) at lower resolution than brightness (luma), exploiting the fact that human vision is more sensitive to brightness differences than colour differences.

Largest Contentful Paint

A Core Web Vitals metric measuring how long it takes the largest visible element — often a hero image — to finish rendering. Reducing image file size directly improves this score.