Image Tools
Resize, compress, convert, crop, rotate, watermark, and edit images.
43 tools available
Synthixx Image Tools handles common image jobs: resizing to exact pixel sizes or a percentage, compressing to a smaller file, converting between JPEG, PNG, WebP and other formats, cropping and rotating, adding text, logos or watermarks, generating favicons and app icons, sizing pictures for social platforms and stripping metadata.
Everything runs in your browser on the HTML canvas, so pictures are not uploaded. The trade-off is that results depend on what your browser can decode and encode: for example, most browsers cannot encode AVIF, and HEIC photos are decoded with a bundled WebAssembly library. The tool pages say when a limit applies.
Pair the image tools with JPG to PDF or PNG to PDF from the PDF category when you need to turn pictures into a document.
Image Resizer
Resize up to 50 images to set pixel dimensions with contain, cover or stretch modes.
Open ToolImage Compressor
Reduce an image's file size with a quality slider, output format choice and optional max dimensions.
Open ToolImage Converter
Convert an image to PNG, JPEG or WebP, with a quality slider for lossy formats.
Open ToolImage Crop
Crop an image by dragging a box or typing exact pixel values, with 1:1, 4:3, 16:9 and 3:2 presets.
Open ToolImage Rotate
Rotate an image by any angle from -180 to 180 degrees and flip it, right in your browser.
Open ToolImage Watermark
Add a centred text watermark to an image with adjustable size, opacity and colour.
Open ToolAdd Text to Image
Write a line of text onto an image with your own size, colour and position.
Open ToolAdd Logo to Image
Overlay a logo image on a photo with position, opacity and size controls.
Open ToolImage Stamp
Stamp a seal, badge or signature image onto a photo at a chosen spot.
Open ToolRemove EXIF
Drop EXIF and other embedded metadata by re-encoding one image in your browser.
Open ToolBulk Image Resize
Resize up to 100 images to one width and height in your browser; several files download as a ZIP.
Open ToolBulk Image Compressor
Compress up to 100 images with one quality slider in your browser; multiple files come back as a ZIP.
Open ToolBulk Image Converter
Convert up to 100 images to PNG, JPEG, WebP or AVIF in your browser; several files download as a ZIP.
Open ToolBulk Image Watermark
Add one text watermark to up to 100 images in your browser; several results download as a ZIP.
Open ToolAspect Ratio Converter
Change an image to 1:1, 4:3, 16:9, 3:2, 9:16 or 2:3 by cropping or padding.
Open ToolResize by Percentage
Scale an image to 10 to 200 percent of its original size, keeping proportions.
Open ToolSocial Media Resize
Resize one image to exact social media sizes by centre-cropping it to the chosen preset.
Open ToolWallpaper Resize
Resize an image to 1920x1080, 2560x1440 or 3840x2160, centre-cropped to fill the frame.
Open ToolInstagram Post Resize
Turn any image into an exact 1080x1080 square by centre-crop.
Open ToolFavicon Generator
Make a ZIP of square PNG favicons (16 to 256 px) from one image, in your browser.
Open ToolApp Icon Generator
Turn one image into square iOS and Android app icon PNGs, delivered as a ZIP.
Open ToolCanvas Resize
Place an image on an exact-size canvas, centred, with a padding colour filling the empty space.
Open ToolJPG to PNG
Convert a single JPG/JPEG image to PNG in your browser, without uploading it.
Open ToolPNG to JPG
Convert a single PNG to a smaller JPG in your browser; transparent areas become white.
Open ToolBMP to PNG
Convert a single BMP bitmap to a lossless PNG in your browser, with no upload.
Open ToolJPG to WebP
Convert a single JPG to WebP in your browser at a fixed quality, with no upload.
Open ToolWebP to JPG
Convert a single WebP image to JPG in your browser; transparent areas become white.
Open ToolPNG to WebP
Convert a single PNG to WebP in your browser, keeping transparency where the browser supports it.
Open ToolWebP to PNG
Convert a single WebP image to a lossless PNG in your browser, keeping transparency.
Open ToolAVIF to JPG
Convert a single AVIF image to JPG in your browser, if your browser can decode AVIF.
Open ToolImage Information
See an image's width, height, format, file size, alpha guess and aspect ratio in your browser.
Open ToolRemove Image Background
Erase a plain, uniform background from one image and save a transparent PNG in your browser.
Open ToolImage Tools FAQ
Are my images uploaded?
No. Resizing, compressing, converting and the other image tools run in your browser, so the picture stays on your device.
Which tool should I use to make a photo smaller?
Use Image Compressor to reduce file size with a quality setting, Image Resizer to change the pixel dimensions, and Image Converter when you want a different format such as WebP.
Can I turn images into a PDF?
Yes. Use JPG to PDF or PNG to PDF in the PDF Tools category, or Combine Files to PDF to put several images into one document.