Developer Toolbox

All tools

Browse by category, or use the search above to quickly open a tool.

43tools
Developer toolbox

Free online developer tools for everyday work

Dev Tools brings together focused browser-based utilities for formatting, encoding, testing, generating, comparing, converting, and checking network paths. Choose a category or open a tool directly; most processing stays on your device, while network tools clearly explain when a remote request is required.

Encoders / Decoders

8 tools
Base64 ImageConvert images to and from Data URLsBase64 TextConvert UTF-8, Base64, and Base64URLCertificate ParserInspect PEM, DER, PFX, and certificate chainsGzipCompress and decompress files or Base64 dataHTML EntitiesEncode and decode HTML textJWTDecode, sign, and verify JSON Web TokensQR CodeGenerate or scan with upload, paste, or cameraURL Encoder / DecoderEncode or decode URL components and full URIs

Testers

3 tools
JSONPath TesterRun path expressions against JSONRegular ExpressionMatch, capture, and replace textXML ValidatorValidate XML documents

Formatters

4 tools
JSON FormatterFormat, minify, and validate JSONSQL FormatterFormat and minify common SQL dialectsXML FormatterFormat, minify, and validate XMLProxy FormatterNormalize proxy schemes and address formats

Generators

5 tools
Hash & ChecksumCalculate digests for text or filesLorem IpsumGenerate placeholder words, sentences, or paragraphsPassword GeneratorGenerate secure random passwordsUUID GeneratorGenerate UUID v1, v4, and v7htpasswdGenerate bcrypt or SHA-1 entries

Text

6 tools
Escape / UnescapeProcess JSON, JavaScript, HTML, and URLsList CompareFind intersections and items unique to either sideMarkdown PreviewSafely edit and preview MarkdownHTML PreviewPreview HTML in a restricted sandboxText CompareCompare differences by character, word, or lineText WorkbenchEdit plain text and compose transformations in one focused workspace.

Converters

6 tools
Cron ParserDetect syntax and predict run timesDate ParserConvert time zones, timestamps, and relative timesJSON to TableView as a table and export CSVJSON to YAML/TOMLConvert between common configuration formatsLoose JSON ConverterParse {key=value} brace structures into JSONRadix ConverterCommon bases, RFC 4648, and custom alphabets

Image processing

1 tools
ID Photo MakerBackground colors, millimeter crops, and print layouts

Network Tools

6 tools
IP CheckLook up an IP address's location, network, and ASNIP Network CheckCompare this browser's IPv4 and IPv6 connectivityBrowser Leak CheckInspect browser-visible IP, WebRTC, and DNS pathsURL Reachability CheckCheck website and API reachability from multiple regionsProxy CheckCheck HTTP, HTTPS, or SOCKS5 proxy connectivityRegional Proxy CheckTest one proxy from a selected region

Network Transfer

2 tools
WebRTC DiagnosticsCheck browser WebRTC, ICE candidates, STUN, and TURNPeer-to-Peer TransferSend files, folders, and text straight between browsers

Application Tools

2 tools
Proxifier Profile EditorEdit Proxifier v2/v3 .ppx profiles with structured formsProxyBridge Profile EditorEdit ProxyBridge .pbprofile files with structured forms