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PNG uses lossless compression by default, so standard tools barely reduce size. Our engine applies advanced color quantization to achieve much smaller files.
Upload PNG Images
Select your PNG screenshots, graphics, or logo files. Transparency (alpha channel) is fully preserved during compression. Upload up to 50 files at once.
Choose Compression Level
Select a target size. For PNGs, our tool reduces the color palette from millions to the optimal number of colors, then applies DEFLATE compression for maximum savings.
Download Optimized PNGs
Download your compressed PNGs with transparency intact. The output remains a valid PNG file — no format conversion needed. ZIP download available for batches.
Why Choose Our PNG Compressor
Lossless Compression
PNG uses the DEFLATE algorithm to compress pixel data losslessly. Row filtering before compression improves ratios for images with repeating patterns.
Color Quantization
Durch die Reduzierung eines 24-Bit-Truecolor-PNG (16 Millionen Farben) auf eine indizierte 8-Bit-Palette (256 Farben) kann die Dateigröße bei minimaler visueller Änderung um 60–80 % verringert werden.
Alpha Transparency
Unlike JPG, PNG supports full 8-bit alpha transparency per pixel. Our compressor preserves every transparency level, so logos and overlays stay crisp.
Metadata Stripping
PNG files can contain large text chunks, color profiles, and timestamps. Stripping these ancillary chunks alone can shave 10-20% off file size with zero visual impact.
Ideal for Graphics
PNG excels at logos, icons, UI screenshots, diagrams, charts, infographics, text overlays, and any image requiring transparent backgrounds or pixel-perfect sharpness.
Sharp Edge Preservation
PNG compression preserves sharp edges and text without the blurring or blockiness artifacts found in lossy formats, making it the best choice for screenshots and diagrams.
Die Kompressionsphysik
How PNG compression works at this target
PNG is lossless — the file format cannot discard image data. To hit small size targets, the compressor has to either (a) reduce the colour palette from 24-bit truecolor to indexed 8-bit (256 colours) or 4-bit (16 colours), which cuts size 40-70% but flattens gradients and can dither smooth areas, or (b) switch encoding to lossy JPG entirely (giving up PNG's transparency and lossless guarantees). For screenshots, diagrams, and logos with limited colours, palette reduction works cleanly. For photographic content saved as PNG, JPG conversion usually gives the best quality-per-kilobyte at this target.
Echte Portale, die Größenzielen zugeordnet sind
Which target size to pick for PNG
Different portals cap PNG uploads at different sizes. Pick the target that matches where you’re uploading rather than shrinking blindly — over-compressing wastes visible quality, under-compressing gets rejected.
Quick answers about compression targets, upload limits, format behavior, and the best cases for compressing PNG files.
How do I compress PNG files online?
Choose a target size, upload your PNG file, and click Compress. iFormat shrinks it to your chosen size while keeping quality as high as possible — free, no watermark, and no account needed.
What sizes can I compress PNG to?
Sie können auf 50 KB, 100 KB, 200 KB, 500 KB, 1 MB oder 2 MB abzielen, jeweils mit einem eigenen dedizierten Tool. Wählen Sie die Größe aus, die dem Upload-Limit oder der E-Mail-Obergrenze entspricht, die Sie einhalten müssen.
How does PNG compression work?
PNG compression is lossless by default — it uses the DEFLATE algorithm to reduce file size without discarding any pixel data. To hit a specific size target, the compressor reduces the color palette (quantization) from 16 million colors down to 256 or fewer, which is lossy but often invisible on screenshots and graphics.
Will compressing reduce PNG quality?
For screenshots, UI mockups, and graphics with flat colors, PNG quantization (reducing to 256 colors) is nearly invisible and cuts file size by 60–80%. For photographs stored as PNG, quantization may introduce visible banding in smooth gradients — JPG or WebP is a better format for photo compression.
Is the PNG compressor free?
Yes. Compressing PNG files is free with no watermark and no sign-up. Paid plans only raise file-size and batch limits.
Are my PNG files kept private?
Ja. Beim Hochladen wird eine verschlüsselte HTTPS-Verbindung verwendet, die Komprimierung läuft auf einem isolierten Worker und sowohl Ihre Originaldatei als auch die komprimierte Datei werden innerhalb eines kurzen Zeitraums automatisch gelöscht – es wird nichts gespeichert, geteilt oder für Schulungen verwendet.
Does PNG compression remove transparency?
No. The compressor preserves alpha-channel transparency. Transparent backgrounds, semi-transparent overlays, and variable opacity all survive compression unchanged.
Related Guides for PNG Compressor
Read file-size, upload, and quality guidance related to compressing PNG files.
