Decode cryptic API error codes into plain explanations — 4xx client errors, 5xx server faults, and retry guidance. Runs locally in your browser.
Content reviewed October 2026 · About Toolzum
Decode Base64 data URIs back into viewable and downloadable images. Recover pictures from API payloads — local decoding, unlimited saves.
Encode special HTML characters into entities (& < >) or decode them back to readable text — display code safely and neutralize injection vectors.
Decode Base64 strings and pretty-print JSON data — paste encoded text to see the decoded result instantly. Inspect API payloads and tokens readably — free, local, no signup.
Convert between plain text and binary in both directions — encode text into its base-2 representation or decode binary strings back to readable text, byte by byte. Files are converted locally in your browser — nothing is uploaded.
Converts .docx files to PDF entirely in your browser — text runs extracted into clean plain-Helvetica pages. No server, no LibreOffice fidelity: complex formatting, tables, and images do not carry over.
4xx client errors, 5xx server faults, and common API-specific codes.
429 and 503 usually yes; 4xx usually means fix the request, not the timing.
Standard codes fully; vendor-specific ones map to their documented meanings.
No — decoding runs locally in your browser, free with no signup.
Random Port Generator
Generate random TCP/UDP port numbers from well-known, registered, or dynamic ranges. Useful for network testing, Docker port mapping, and firewall configuration.
Chmod Calculator
Convert between numeric (755) and symbolic (u=rwx,g=rx,o=rx) chmod permission formats. See detailed breakdown for owner, group, and others.
Docker Run to Compose Converter
Convert docker run commands to docker-compose.yml format. Supports ports, volumes, environment variables, networks, restart policies, and container names.
Email Normalizer
Normalize email addresses by removing dots (Gmail), stripping +tags, and lowercasing. Process multiple emails at once for deduplication and cleaning.
Diff Checker
Compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors. Code never leaves your device — formatting and validation run locally in your browser.
IP Address Lookup
Displays your public IPv4 and IPv6 addresses with geolocation data (city, ISP, ASN, timezone). Network engineers use it to verify VPN connectivity. Uses cloud-based processing.