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Image how-to guides

Short, practical walkthroughs for the image jobs people search for most. Each one gives the answer first, then the steps, and links to the free tool that does the work in your browser.

• 📦How to compress an image without losing qualityShrink JPG, PNG and WebP files in your browser. Pick a quality, check the before and after sizes, and download. No upload, no sign-up.
• 📐How to resize an image by pixels, percent or file sizeChange an image to exact pixel sizes, a percentage, or a target file size in KB, in your browser. Keeps the proportions. No upload.
• ✂️How to crop an image to the exact area you wantCrop a picture by dragging a box, locking a ratio such as 1:1 or 16:9, or typing exact pixels. Free, in your browser, no upload.
• 💧How to add a text watermark to a photoPut your name or a copyright line on pictures. Choose position, size, opacity and colour, or repeat it across the image. Done in your browser.
• 🏷️How to put your logo on a photoPlace your logo on one picture or many. Pick the position, size and opacity, or repeat it across the image. Runs in your browser.
• 🪪How to resize a photo and signature for an exam formGet a photo, signature or thumb impression to the exact pixels and KB an exam form asks for, using requirements from official notices.
• 🔁How to convert images between JPG, PNG, WebP and HEICOpen iPhone HEIC photos, switch between JPG, PNG and WebP, or make a PDF. Converts in your browser with no upload and no sign-up.
• 📄How to combine images into one PDFPut several JPG, PNG or WebP images into a single PDF, choose the page order and A4 or image-size pages. Runs in your browser.
• 🔄How to rotate or flip an imageTurn a picture 90, 180 or 270 degrees, or mirror it horizontally or vertically. Works on JPG, PNG and WebP, in your browser.
• 🛡️How to remove location and EXIF data from a photoStrip the hidden location, date and camera details from a photo before you share it. Done in your browser, and the picture is not recompressed.
• ⭕How to make a round profile pictureCrop any photo into a circle, or just round the corners, and save it as a PNG with see-through corners. Free, in your browser.
• 🧩How to split an image into a grid of tilesCut a picture into equal rows and columns for a grid post or a puzzle, up to 10 by 10, and download the tiles as a ZIP. In your browser.
• 🔠How to add text to a pictureWrite a caption or title on a picture. Choose the position, size and colour, with an optional panel behind the text. Done in your browser.
• 👾How to turn a photo into pixel artMake chunky pixel art from any photo. Choose how big the pixels are and how many colours to keep. Saved as a PNG, no upload.
• 🪢How to merge images side by side or one above the otherJoin two or more pictures into one, in a row or a column, with an optional gap and background. Saved as PNG, JPG or WebP. In your browser.
• 🌫️How to blur or hide part of an imageDrag boxes over a name, number or face and blur, pixelate or cover them. Runs in your browser, so the original never leaves your device.
• 📏How to convert pixels to centimetres and inchesWork out how big a picture is on paper from its pixels and DPI, or how many pixels A4 needs. A free calculator with common paper sizes.
• 🧮How to calculate an aspect ratioFind the aspect ratio of any width and height, or work out the matching height or width for a ratio. A free calculator with common ratios.
• 🎚️How to adjust brightness, contrast and colours, or make a photo black and whiteChange brightness, contrast and colour strength, or apply black and white, sepia or negative. Live preview, in your browser, no upload.
• 🖼️How to add a border or frame to a picturePut a white, black or coloured border around any picture, or a see-through one. Choose the thickness and see a preview. In your browser.
• 🎯How to get the HEX colour code from an imageClick any picture to get the exact colour in HEX, RGB and HSL with a one-click copy. Works with the keyboard too. In your browser.
• 🎨How to get a colour palette from an imagePull the main colours out of a picture with their HEX codes and how much of the picture each covers. Copy as a list or CSS variables.
• 🧬How to convert an image to Base64 (and back)Turn a picture into a Base64 data URI for HTML or CSS, or paste Base64 and get the image back. Done in your browser, nothing uploaded.
• ⭐How to make a favicon for your websiteMake favicon.ico, 16 and 32 pixel PNGs, an Apple touch icon and Android icons from one picture, with the code to paste into your page.
• 🛡️Are online image tools safe? How to check yoursMany online image tools upload your photo to a server. Here is how to tell, how to check in two minutes, and what iDuckImg does instead.