Developer tools
Fast browser-first utilities for everyday debugging.
ToolsNHelpers brings common developer tasks into one local-first workspace: format data, convert encodings, generate secure values, inspect timestamps, decode certificates, parse HTTP details, and compare text without installing separate utilities.
Built For Practical Development Work
Each tool is designed around a focused workflow with clear inputs, visible outputs, and copy or download actions where they are useful. The collection is meant for debugging API payloads, preparing test data, checking cryptographic values, documenting examples, and validating text formats during day-to-day software work.
Privacy-Aware By Default
Most utilities run in the browser, so pasted snippets and generated values stay on your device unless a feature explicitly needs a server or third-party service. Tool pages include privacy labels and short notes to explain how each utility handles your input.
Focused Tool Categories
The collection is grouped by task type so users can move quickly between related workflows: formatting and conversion, encoding and decoding, text inspection, cryptographic helpers, generators, HTTP diagnostics, and time or data conversion. Each page includes a working tool plus notes about practical usage and limitations.
Designed For Reviewable Output
Tools keep inputs and outputs visible side by side where useful, report validation errors in context, and provide copy or download actions for generated values. This makes the pages useful for debugging and documentation while avoiding hidden processing or misleading results.
Maintained Site Pages
The About, Privacy Policy, Contact, and Editorial Policy pages explain who the site is for, how information is handled, how advertising is placed, and how corrections can be requested. These pages are linked from the main navigation and footer so users do not have to hunt for them.
Format & Convert
Format structured data, move between common interchange formats, and make copied payloads easier to inspect before they go into documentation, APIs, or configuration files.
Format, validate, and inspect JSON in the browser.
Runs in your browserFormat & Convert YAML JSON ConverterConvert YAML to JSON and JSON back to YAML locally.
Runs in your browserFormat & Convert XML FormatterFormat, validate, and minify XML in the browser.
Runs in your browserFormat & Convert JSON to TypeScriptInfer TypeScript interfaces from JSON samples.
Runs in your browserFormat & Convert JSON CSV ConverterConvert JSON arrays to CSV and CSV rows to JSON.
Runs in your browserFormat & Convert SQL FormatterFormat and minify SQL across common dialects.
Runs in your browserEncode / Decode
Work with transport encodings, signatures, tokens, and escaped text while keeping the source value visible for review.
Encode and decode Base64 text.
Runs in your browserEncode / Decode HTML EntitiesEncode and decode HTML entities locally.
Runs in your browserEncode / Decode HMAC GeneratorGenerate HMAC digests with SHA algorithms in the browser.
Runs in your browserEncode / Decode Hex ASCII ConverterConvert text to hex bytes and hex bytes back to text.
Runs in your browserEncode / Decode URL EncodeEncode and decode URL components or full URLs.
Runs in your browserEncode / Decode JWT DecoderInspect JWT headers and payloads locally.
Runs in your browserText
Test regular expressions and compare text changes directly in the browser for quick debugging and support workflows.
Crypto
Generate and inspect hashes, signatures, certificates, keys, and password hashes for development and verification tasks.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.
Runs in your browserCrypto RSA Keypair GeneratorGenerate local RSA private PEM and SSH public keys.
Runs in your browserCrypto Certificate DecoderDecode PEM and CRT certificate structure locally.
Runs in your browserCrypto bcrypt Hash VerifyCreate and verify local password hashes with cost controls.
Runs in your browserGenerators
Create local test values, placeholder material, QR codes, and sample records for prototypes, QA, and documentation.
Generate one or many UUID v4 values.
Runs in your browserGenerators Password GeneratorGenerate secure passwords with configurable length and character classes.
Runs in your browserGenerators Lorem IpsumGenerate words, sentences, paragraphs, and HTML-wrapped placeholder copy.
Runs in your browserGenerators QR Code GeneratorGenerate downloadable SVG and PNG QR-style codes locally.
Runs in your browserGenerators Fake Data GeneratorGenerate fake names, emails, addresses, phone numbers, and test cards.
Runs in your browserNetworking & HTTP
Inspect URLs, user-agent strings, and cURL commands when troubleshooting web requests and API integrations.
Convert cURL commands to Python requests, fetch, Go, PHP, or Node axios.
Runs in your browserNetworking & HTTP URL ParserParse URL scheme, host, port, path, query, and fragment.
Runs in your browserNetworking & HTTP User-Agent ParserParse browser, OS, device, engine, and bot hints from User-Agent strings.
Runs in your browserTime & Data
Convert timestamps, timezones, byte sizes, number bases, and cron expressions with notes about units and runtime differences.
Convert Unix timestamps and local date times.
Runs in your browserTime & Data Cron ExplainerExplain simple cron expressions and preview upcoming runs.
Runs in your browserTime & Data Cron BuilderBuild five-field cron expressions from guided schedule controls.
Runs in your browserTime & Data Timezone ConverterConvert date and time values across IANA timezones.
Runs in your browserTime & Data Number Base ConverterConvert numbers between binary, octal, decimal, and hex.
Runs in your browserTime & Data Byte Size ConverterConvert byte sizes between decimal and binary units.
Runs in your browser