How much can I expect to save?

Typical phone photos shrink by 70–90% when re-encoded as JPG at quality 80% and capped at 2560 px on the long side. PNGs of UI screenshots can shrink by 60–85% when converted to JPG, or 30–60% as WebP. The result list shows the exact byte savings per image, and the whole pipeline runs in your browser via the Canvas API — nothing is uploaded.

What's the right quality setting?

80% is the sweet spot for photos and most viewers cannot tell it apart from the original. Drop to 70% for thumbnails or social media uploads where bandwidth matters more than fidelity. Push to 90%+ for archival or professional use where you may re-edit later.

Should I pick JPG, WebP, or PNG?

JPG is the universal default for photos and the smallest format every viewer can open. WebP is roughly 25% smaller than JPG at the same visual quality and is supported in every modern browser, email client, and OS. PNG is lossless — only pick it for screenshots, logos, or images that must keep transparency.

Why is the cap-the-longest-side option enabled by default?

Modern phones produce photos that are 4000–6000 px wide, way more than any screen needs. Capping at 2560 px alone usually shrinks the file by 50–80% before the JPEG re-encode even runs. Disable the cap if you need the full original resolution for print or large-format display.

Image Compressor

Shrink JPG, PNG, and WebP images by up to 90% with no visible loss. 100% in your browser.

Files are never uploaded.

•How this works

Drop images to compress

Supports JPG, PNG, and WebP · drop one or many

Drag up to 50 files·or a .zip of images

How to compress an image — step by step

Open Image Compressor. Go to converter.plus/image-compressor in any browser.
Drop your images. Drag JPG, PNG, or WebP files onto the drop zone, or click to select them.
Pick a target format. Auto picks the smartest format per image (JPG for photos, WebP if you want extra savings).
Adjust quality and dimension cap. Quality 80% is the sweet spot. Cap the longest side at 2560 px for huge phone photos.
Click Compress images. Compression runs locally with the Canvas API. Download each image or grab them all in a ZIP.

Why use Image Compressor

✓Lossy mode (MozJPEG / WebP / AVIF) typically shrinks photos 60–85% with no visible quality loss at quality 75–85.
✓Lossless mode (PNG OptiPNG-equivalent + WebP lossless) cuts logos and screenshots 10–35% with byte-exact pixels.
✓Live before/after byte counter and side-by-side preview show exactly what each setting costs visually.
✓Runs 100% in your browser using the same engine as the main Image Optimizer — no upload, no server-side step.
✓Batch process 50+ images at once and download them as a single ZIP archive.
✓Free with no signup, no watermark, and no per-file size limit beyond what your browser can hold in memory.

What is an image compressor?

An image compressor reduces the file size of a picture by re-encoding it at a lower quality, switching to a more efficient format, or scaling it down to a sensible maximum dimension — usually all three together. The result looks visually identical to the human eye but takes a fraction of the bytes to download, store, or send. Image Compressor is a thin landing-page wrapper around the same browser-based encoder that powers /image-optimizer; both share a single encode pipeline, so the output bytes match exactly.

What format should I pick?

JPG is the universal default for photographs — every viewer can open it and the format is excellent at compressing real-world scenes. WebP produces files roughly 25–35% smaller than JPG at the same perceived quality and is supported in every modern browser, OS, and email client; it's the best default for the web today. PNG is lossless — only choose it for screenshots, logos, or images that must keep transparency. The "Auto" setting picks JPG for opaque photos and WebP for screenshots so you don't have to think about it.

Why compress images?

Faster page loads — images are usually 50–80% of a page's downloaded bytes. Compressed images directly improve Largest Contentful Paint (LCP) and Core Web Vitals.
Lower bandwidth — important for mobile users, anyone on a metered connection, and your hosting bill.
Email-friendly attachments — most providers cap attachments at 25 MB; a single phone photo can be 8 MB on its own.
Storage savings — backing up 10,000 vacation photos becomes affordable when each is 200 KB instead of 4 MB.
Higher SEO rankings — Google explicitly rewards pages that serve next-gen formats like WebP and AVIF.

Is it private?

Yes. The whole conversion happens in your browser using the Canvas API — the same pipeline the main Image Optimizer uses. Your images are never uploaded, there is no file-size limit imposed by a server, and the tool works offline once the page has loaded.

Frequently Asked Questions

Related free tools

Image OptimizerCompress JPG, PNG, and WebP without quality loss.

Remove BackgroundErase the background from any photo to a transparent PNG.

JPG to WebP ConverterCut JPG file sizes 25–35% with no visible quality loss by re-encoding to WebP — perfect for Core Web Vitals, lower CDN bills, and faster mobile pages. Runs entirely in your browser.

PNG to WebP ConverterCut PNG asset sizes 26% in lossless WebP — or up to 80% for photographic PNGs in lossy mode — while keeping full transparency. Ideal for design pipelines, app icons, and CMS hero images.

JPG to AVIF ConverterCut JPG payloads up to 50% with AVIF — the best modern image codec for Core Web Vitals. Convert in batch, in your browser, with no upload and no signup.

PNG to JPG ConverterCut PNG file sizes 70–80% by converting to JPG — the fastest way to fix "image too large" upload errors for screenshots, exports, and bulk asset migrations. Runs entirely in your browser.

Privacy & trust

•Images are read into your browser memory only — no upload, no server-side processing, no third-party API.
•Works offline once the page has loaded; suitable for confidential photos and screenshots.
•No account, no email, no payment information collected; free for personal and commercial use.
•Output files contain no Converter.Plus watermark, footer, or telemetry; EXIF is stripped by default for privacy.