Image Compressor – Shrink Photos Without Uploading Them

Make image files smaller for websites, email and forms — right here in your browser. Load a photo, move the quality slider, and this free image compressor shows you the exact before and after file sizes before you download. Nothing is uploaded: the compression happens on your own device.

Compress Your Image

Drop an image here or click to browse — JPG, PNG, WebP, GIF or BMP from your device

Preview of the image you are compressing

No image loaded yet. Your image is processed locally — it is never uploaded.

Quality: 80% — lower quality means a smaller file

80% is the sweet spot for most photos: typically 60–80% smaller with no visible difference. The slider has no effect on PNG output (PNG is lossless).

Output format

Max width/height (px, optional)

Compressed file size

–

Original size	–
Compressed size	–
You saved	–
Dimensions	–
Format	–

Download Compressed Image

How to Use the Image Compressor

Drop a photo into the box above, or tap it to browse your device. The moment an image loads, the compressor produces a compressed copy at 80% quality and shows you both file sizes side by side, so you can see exactly what you save before downloading anything. Move the quality slider and the preview updates live: drag it down and watch the compressed size shrink, drag it up if you want maximum fidelity. If the file still is not small enough, switch the format to WebP — on photographs it is typically another 25–35% smaller than JPG at the same visual quality — or set a maximum width and height to shrink oversized phone photos down to the size they will actually be displayed at.

Nothing leaves your device at any point. The image is decoded and re-encoded by your own browser using the same canvas technology that powers photo editors, which is also why there is no file-size limit imposed by a server and no queue to wait in. When the numbers look right, press Download Compressed Image and the file saves with "-compressed" added to its name, so your original stays untouched.

How Image Compression Actually Works

Every image format stores pixels differently, and compression means re-storing them more cheaply. Lossy compression (JPG and WebP) permanently discards detail your eye is unlikely to notice — mostly fine texture in areas of smooth colour such as skies and skin — and the quality slider controls how aggressively it discards. At 100% almost everything is kept; at 80% the discarded detail is essentially invisible in a photograph; below 60% you start to see blocky artefacts around edges and text. Lossless compression (PNG) keeps every pixel exactly and only packs the data more efficiently, which is why PNG files stay large for photographs but are the right choice for logos, screenshots and anything with sharp text.

One honest detail many tools hide: re-saving a PNG as a PNG can only shrink it slightly, because the pixels are already stored losslessly. Real savings on a PNG photo come from converting it to JPG or WebP — or from reducing its dimensions. A 4,000 × 3,000 phone photo displayed at 800 pixels wide on a website carries sixteen times more pixels than anyone will ever see, so resizing is often the single biggest, safest saving available.

Which Quality Setting Should You Use?

Quality	Typical saving	Best for
90–100%	10–30% smaller	Archiving, print, professional portfolios
80–85%	60–80% smaller	Website hero images, blog photos, listings — the default sweet spot
70–75%	75–85% smaller	Thumbnails, gallery grids, social uploads, email attachments
50–65%	85–92% smaller	Previews and placeholders where a little softness is acceptable
Below 50%	92%+ smaller	Rarely worth it — artefacts become obvious

Worked example: a 4.2 MB phone photo at 4,032 × 3,024 pixels. Compressed as a JPG at 80% quality it lands near 900 KB with no visible change on a screen. The same file as WebP at 80% is closer to 620 KB. Add a maximum dimension of 1,600 pixels — still sharper than most laptop screens — and the WebP drops under 200 KB, a 95% saving, because the resize discards pixels instead of detail. That is the combination most websites actually want.

Two side effects of browser compression are worth knowing. First, re-encoding strips the EXIF metadata cameras embed in photos — GPS coordinates, device model and timestamps — which is a quiet privacy win when you share images publicly, though you should keep the untouched original if you rely on that data for organising your library. Second, compressing an already-compressed JPG again always costs a little quality, because lossy artefacts compound; work from the original camera file whenever you can, and treat each compressed output as a finished copy, not a new master.

Limitations

Compression is a one-way door: detail discarded by a lossy save cannot be recovered, so always keep your original file — this tool never alters it. Animated GIFs are flattened to their first frame, because the browser canvas does not preserve animation. Extremely large images (for example 100-megapixel scans) may exceed your browser's memory on low-end phones; if a file fails to load, resize it first or try on a laptop. And while WebP is supported by every modern browser, a few older applications still cannot open it — if you are sending a file to someone else's older software, JPG is the safest choice.

Guides for This Tool

How to Compress an Image: Smaller Files, the Same Photo — JPG, PNG and WebP Explained

Shrink any photo in your browser — the quality slider, WebP vs JPG, resizing, and the 80% sweet spot. No uploads, no watermarks, no limits.

Frequently Asked Questions

Is this image compressor really free, and are my photos uploaded?

Yes, it is completely free, and no — your photos are never uploaded. The compression runs entirely in your own browser using built-in canvas technology, so there is no server storing, scanning or even seeing your images. That also means the tool keeps working on private or sensitive images, such as documents and family photos, and there is no sign-up, watermark or daily limit.

What is the difference between JPG, PNG and WebP compression?

JPG uses lossy compression tuned for photographs and gives small files with quality you control. PNG is lossless — every pixel is preserved exactly — which makes it ideal for logos, screenshots and text, but large for photos. WebP is a newer format that usually produces files 25–35% smaller than JPG at the same visual quality and also supports transparency. Every modern browser can open WebP; JPG remains the most universally compatible choice.

Why did my compressed file come out larger than the original?

That can happen when the original was already highly compressed — for example a JPG saved at low quality by another app — and you re-save it at 100% quality, or convert a small JPG to PNG. The result box tells you honestly when the new file is larger and suggests the fix: lower the quality slider, choose WebP, or set a maximum dimension so the pixel count itself comes down.

What quality should I use for website images?

For most website photographs, 80% quality in WebP (or JPG as a fallback) is the sweet spot: files are typically 60–80% smaller than the original with no difference a visitor can see. Also resize to the largest size the image will actually be displayed at — a hero image rarely needs to be wider than 1,920 pixels, and content images are usually fine at 1,200 pixels wide.

Does compressing an image reduce its dimensions?

Only if you ask it to. By default this compressor keeps the original pixel dimensions and only changes the file encoding, so the saving comes purely from compression. If you enter a maximum width or height, the image is scaled down proportionally to fit inside it — never stretched — which produces the largest savings on oversized phone and camera photos.

Can I compress a PNG without losing quality?

You can re-save a PNG losslessly, but the saving is small because PNG data is already packed efficiently. The meaningful choices for a large PNG are converting it to WebP (which supports transparency and is usually far smaller) or to JPG if it is a photograph without transparency. For a logo or screenshot with sharp text, keep PNG and accept the size, or reduce its dimensions.

Image Compressor – Shrink Photos Without Uploading Them

Compress Your Image

How to Use the Image Compressor

How Image Compression Actually Works

Which Quality Setting Should You Use?

Limitations

Guides for This Tool

How to Compress an Image: Smaller Files, the Same Photo — JPG, PNG and WebP Explained

Frequently Asked Questions

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