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Bawitools

Image Compressor

Supports: JPG, PNG, WEBP, AVIF, GIF, BMP, TIFF · 100% local, no file uploads required. Free online.

Upload your image

Drag and drop or click to select

📄 📷 .jpg,.jpeg,.png,.webp,.gif,.bmp
WHAT IS OPTIMIZEDCompress JPG, PNG, WEBP, and GIF while maintaining visual quality.

COMPRESSION MODE

Safe

5–25%
Only recompress the ZIP. Preserves absolutely everything: videos, macros, transitions, animations.

Balanced

25–55%
Recompress ZIP + optimize images to 85% quality.

Maximum

45–75%
Images at 70% quality with reduced resolution.

RESULT

The compressed file will appear here

Select or drag a file to start
Image compression guide

Compressing images: cutting the weight without changing format

What compressing an image actually does, how it differs from resizing, and how far it is worth pushing

Compressing an image means reducing its size on disk while keeping the same format and the same dimensions. That is different from converting it — which changes the format — and different from resizing it — which changes the pixel count. All three shrink the file, but by different routes and with different consequences.
OperationWhat changesWhen to use it
CompressInternal detail; format and dimensions stayThe image displays at the right size but weighs too much
ResizeThe pixel count: the image becomes smallerThe image has far more resolution than will ever be used
ConvertThe file formatYou need another format for compatibility or efficiency

What compression actually does

In a lossy format such as JPEG or WebP, compressing means adjusting how much fine detail is discarded. The encoder analyses the image region by region and decides which variations are subtle enough that the eye will not miss them. Lowering quality widens that margin: more information is thrown out and the file shrinks.
The relationship is not linear, and that is the most useful practical fact: the first steps down in quality cut the weight enormously with no visible difference, while the last ones barely reduce anything and degrade visibly instead. The sweet spot is at the top of the scale, not at the extreme.

How far to push, by intended use

DestinationGuidelineNote
Web and social mediaHigh quality, not maximumPlatforms usually re-encode on upload anyway
Email attachmentMedium-high qualityThe goal is usually getting under a specific size limit
Document headed for printHigh qualityPrinting reveals artefacts that go unnoticed on screen
Archive or master copyDo not compressKeep the original intact and compress only working copies

Generation loss: the most expensive mistake

Every time a lossy image is compressed, information is discarded. Take the result and compress it again and the new loss is applied to an already degraded image — and the damage accumulates. Repeated a few times, the result fills with blocking and halos even if every individual step used a "high" quality setting.
The practical rule: always compress from the original, never from an already compressed version. If you need to try several levels, go back to the source file each time rather than chaining compressions.

Which images compress best

  • Photographs with smooth areas — skies, portraits, landscapes — compress extraordinarily well: there is plenty of redundant information to discard unnoticed.
  • Images with heavy grain or fine texture — foliage, sand, high-ISO shots with sensor noise — resist: almost every pixel differs from its neighbour and there is little headroom.
  • Screenshots, text and flat graphics react badly to lossy compression: sharp edges generate very visible halos. A lossless format suits these far better.
  • Already compressed images have little additional headroom, and forcing it only produces generation loss.

Compressing your images step by step

Check the dimensions first

If the image has far more resolution than you need, resizing it first will save more and degrade nothing.

Upload your images

Drag them onto the drop zone or click to select them. Everything is processed inside your browser.

Adjust the level and watch the result

Start at a high quality and step down gradually. The moment you see artefacts, you have passed the optimum.

Download and keep the original

Always keep the source file: if you later need another version, you will want to compress from it rather than from the copy.

Resizing changes the image's pixel count; compressing keeps the dimensions and reduces the internal detail that gets stored. If your image is much larger than it will ever be displayed, resizing saves more with no appreciable loss.

At high quality settings, on an ordinary photograph it is practically imperceptible. Degradation becomes visible when you go much lower: blocking appears in flat areas and halos around sharp edges.

You can, but you should not: each lossy compression is applied to the already degraded result of the previous one and the damage accumulates. Always compress from the original file.

No. Compression keeps the same format; a JPG stays a JPG and a PNG stays a PNG. If what you need is a format change, use the corresponding converter.

Because PNG is lossless: it discards nothing and only optimises the encoding, so the headroom is far smaller. If the content is photographic and you do not need transparency, converting to JPG or WebP will save a great deal more.

Yes. All processing happens inside your browser and the images are never sent to any server, so neither the photos nor any location data in their metadata leaves your device.

Free

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100% local compression

Your images are never uploaded to a server

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