Flip Image

What it does

Flipping an image horizontally (left-right mirror) or vertically (top-bottom mirror) is one of the most-requested basic image operations and one of the few that mathematically preserves all pixel data — no quality loss, no compression artifacts, just a coordinate transformation. Use cases span design, photography, social media, and functional needs: correcting accidentally mirrored selfies (most phone cameras flip the preview by default but save the unflipped original — confusing), creating symmetrical compositions for design or art, mirroring text for transfer printing or iron-on craft projects, fixing a webcam shot where you wrote on a whiteboard backwards, or building reflection effects for product photography.

Under the hood: horizontal flip negates the x-axis transform (every pixel at column x moves to column width-1-x); vertical flip does the same on y-axis. Both operations are implemented natively in Canvas 2D via ctx.scale(-1, 1) for horizontal or ctx.scale(1, -1) for vertical, then drawImage with adjusted positioning. The source data is fully preserved — re-encoding back to PNG produces a pixel-perfect mirror; re-encoding to JPG introduces fresh compression but the underlying pixels are mirrored exactly. Output supports PNG (with transparency), JPG (smaller), or WebP (smallest at equivalent quality).

Practical notes that catch first-time users: (1) flipping doesn’t change file size — mirrored compresses about the same as original. (2) EXIF metadata (camera, GPS, timestamp) is typically stripped in browser-based tools because Canvas doesn’t preserve it; use a desktop tool if you need EXIF retained. (3) Flipping a portrait photo of a person with text in the background reverses the text — fine for aesthetics, problematic if the text is meaningful. (4) For 2D rotation (90°/180°), use the image-rotate tool instead — flip and rotate are different operations.

How to use it

1. Drop your image (PNG, JPG, WebP) or click to browse.
2. Pick flip direction: horizontal (left-right mirror) or vertical (top-bottom mirror).
3. Preview the result before downloading.
4. Choose output format — PNG (preserves transparency), JPG (smaller), WebP (smallest modern).
5. Download and verify in your destination app.

When to use this tool

• Correcting an accidentally-mirrored selfie that the phone preview flipped.
• Creating symmetrical design compositions or kaleidoscope effects.
• Mirroring text for iron-on transfer or window decals.
• Building reflection effects below product photos.
• Flipping screenshots from someone else’s app where the orientation is wrong.

When not to use it

• Rotating images by arbitrary degrees — use the image-rotate tool, which handles 90°/180°/270° and arbitrary angles.
• Cropping or resizing — those are different operations with their own tools.
• When you need to preserve all EXIF metadata — browser-based flipping strips it; use desktop ExifTool instead.
• Batch-flipping hundreds of files — browser tools work for tens; for hundreds use ImageMagick or XnConvert CLI.

Common use cases

• Quick use during a typical workday
• Pre-decision sanity-check on inputs and outputs
• Educational use — demonstrating the underlying concept
• Onboarding a colleague who needs the same calculation/conversion