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OneClickTool

Free online tools, ready in one click

OneClickTool helps you finish image, PDF, QR, text, developer, and everyday calculator tasks quickly.

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Featured Tools

Start common tasks right away.

Image CompressorReduce images for upload limitsDPI ChangerBatch change image DPI and pixel sizeImage WatermarkApply one watermark across a batch of imagesASCII Art GeneratorTurn images into copyable ASCII text art

All Tools

Image, PDF, QR, text, calculator, and developer tools ready when you need them.

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Compress
Image Compressor
Target SizeSize limit helper

Image Compressor

Reduce images for upload limits

500KB/1MB presetsWebP/JPG output
Resize
DPI Changer
DPI/PixelsBatch DPI and pixels

DPI Changer

Batch change image DPI and pixel size

72-600 DPI presetsJPG/PNG output
Watermark
Image Watermark
WatermarkBatch logo overlay

Image Watermark

Apply one watermark across a batch of images

Image watermarkDiagonal/horizontal repeat
ASCII
ASCII Art Generator
ASCII ArtImage to text art

ASCII Art Generator

Turn images into copyable ASCII text art

32-240 columnsEdge detail