Tools

Computes field of view, GSD and ppmm from the sensor, lens and working distance.

Recommends a focal length that covers the target width at the required resolution (ppmm).

Computes the near limit, far limit and hyperfocal distance from the aperture and CoC.

Measures pixels per millimeter against a reference of known length.

Makes a printable checkerboard PDF with the square size and margins you choose.

Picks a webcam and locks its exposure and white balance.

Zooms and pans an image to inspect color values pixel by pixel.

Flattens a tilted subject into a plane view with a 4-point homography.

Shows per-channel histograms to find over- and underexposed clipping.

Corrects vignetting and dust with a uniform reference frame.

Applies global and Otsu thresholds with a live preview.

Extracts hue, saturation and value ranges from sample pixels.

Applies dilation, erosion, opening and closing with an adjustable kernel.

Detects Canny edges while adjusting Gaussian smoothing.

Analyzes connected components and filters them by area and aspect ratio.

Reads 1D and 2D codes with the BarcodeDetector API and a wasm fallback.

A code editor with syntax highlighting for many languages.

Edits LaTeX documents and equations with a live preview, and saves to PDF from the print dialog.

Edits Mermaid diagrams such as flowcharts, sequence diagrams and Gantt charts with a live preview, and exports SVG and PNG.

Views and edits the bytes of a file in an offset / hex / ASCII layout.

Crops, rotates, adjusts, filters and annotates images right in the browser.

A 3D modeler where you draw faces and edges and extrude them into solids.

Pretty-prints JSON with indentation or minifies it to one line.

Encodes text to Base64 and decodes it back.

Decodes a JWT to inspect its header, payload and signature.

Converts between PEM (Base64 armored) and DER (binary) encodings.

Searches emoji, shows their code points and copies them in the format you want.

Computes SHA-1, SHA-256, SHA-384 and SHA-512 digests of text.

Computes the HMAC of a message with SHA-256/384/512.

Encrypts and decrypts text with AES-GCM using a passphrase (PBKDF2).

Generates RSA, EC and Ed25519 key pairs and exports them as PEM.

Generates cryptographically secure random bytes or passwords.

Builds and sends REST API requests and shows the responses.

Gathers WebRTC ICE candidates through STUN/TURN servers to check that the servers are reachable.

Makes a WiFi login QR code with the SSID and password, to download or print.

Converts between HEX, RGB and HSL color notations.

A calculator with arithmetic, percentages, sign toggling and keyboard input.

Builds and explains cron expressions and previews the next run times.