42 free deterministic utilities: JSON, CSV, YAML, encoding, hashing, JWT, cron, formatters, CSS.
Scored across 42 tools
Several tools overlap in purpose: hash_text and sha256_hash both compute SHA digests; markdown_to_html and markdown_preview both render Markdown to HTML; meta_tags_generate and og_preview_build both generate social meta tags; csv_parse and csv_to_json both parse CSV. Descriptions help, but the boundaries are not always crisp.
All names use snake_case and are descriptive, but verb placement is mixed (e.g., hash_text, regex_test vs base64_decode, csv_parse) and conversion tools use a different <format>_to_<format> pattern. Still consistent enough to be predictable.
42 tools is well above the typical 3-15 range for a coherent set; while each tool is small, the breadth imposes a high selection burden on an agent. The server's 'One Million Tools' branding suggests a broad toolkit, but the count is heavy.
The surface covers a wide range of common utility domains (encoding, formatting, conversion, hashing, CSS, CSV/JSON/YAML, Markdown, URL, etc.) with few obvious gaps. Missing items like XML/TOML formatters, HTML-to-Markdown, date parsing beyond Unix timestamps, or text case conversion are minor for a general toolkit.
Base64 string → UTF-8 text.
Inputs: input (required).
UTF-8 text → Base64 string.
Inputs: input (required).
Convert a HEX color into RGB / HSL / HSV / CSS forms.
Inputs: hex (required).
Explain a cron expression in plain English.
Inputs: expression (required).
Build a CSS border-radius value from four corner radii in px.
Inputs: bl, br, tl, tr.
Build a CSS box-shadow value from one or more layers.
Inputs: layers (required).
Compute the WCAG contrast ratio between two colors and the AA/AAA verdict.
Inputs: background (required), foreground (required).
Pretty-print CSS.
Inputs: input (required), indent, printWidth.
Build a CSS linear-gradient string from color stops + angle.
Inputs: stops (required), angle.
Filter CSV rows by a column predicate (equals / contains / regex / gt / gte / lt / lte / not-empty).
Inputs: input (required), column (required), mode, value, +1 more.
Parse CSV text into fields + preview rows with delimiter detection.
Inputs: input (required), delimiter, previewRows.
Sort CSV rows by one column (alpha or numeric).
Inputs: input (required), column (required), mode, delimiter, +1 more.
Split a CSV into N chunks or into files of N rows each.
Inputs: input (required), mode, chunks, rowsPerChunk.
Compute per-column summary statistics (count, min, max, mean, median) over a CSV.
Inputs: input (required).
Parse CSV text into a JSON array of objects.
Inputs: input (required).
Redact secrets (API keys, tokens, passwords) from logs / config / env text.
Inputs: input (required).
Compute a SHA-1 / SHA-256 / SHA-512 hex digest of UTF-8 text.
Inputs: input (required), algorithm.
Pretty-print HTML.
Inputs: input (required), indent, printWidth.
Pretty-print JavaScript / TypeScript with Prettier.
Inputs: input (required), semi, indent, parser, +2 more.
Diff two JSON documents and return added/removed/changed keys.
Inputs: left (required), right (required).
Pretty-print JSON with configurable indentation (2 spaces, 4 spaces, or tab).
Inputs: input (required), indent.
Compress JSON by stripping whitespace.
Inputs: input (required).
Convert an array of JSON objects to CSV.
Inputs: input (required).
Convert JSON to YAML.
Inputs: input (required).
Validate JSON syntax and return the parsed value or a line/column error.
Inputs: input (required).
Decode a JWT header + payload. Does not verify the signature.
Inputs: token (required).
Normalize Markdown (list markers, trailing whitespace, blank lines).
Inputs: input (required), listMarker, trimTrailing, collapseBlankLines.
Render Markdown to an HTML preview fragment with word/char counts.
Inputs: input (required), gfm, breaks.
Convert Markdown to HTML.
Inputs: input (required), gfm, breaks.
Generate , description, Open Graph and Twitter Card tags for a page.
Inputs: title (required), description (required), url, type, +6 more.
Build an Open Graph preview metadata bundle (title / description / domain truncation).
Inputs: title (required), description (required), url, imageUrl, +1 more.
Test a regular expression against input text and return matches with capture groups.
Inputs: input (required), pattern (required), flags, replacement.
Compute a SHA-256 hex digest of UTF-8 text.
Inputs: input (required).
Generate a URL slug from a string.
Inputs: input (required), lowercase, maxLength, separator, +2 more.
Pretty-print SQL.
Inputs: input (required), indent, dialect, keywordCase.
Diff two texts and return part-level changes plus a unified string.
Inputs: left (required), right (required), mode.
Convert a Unix timestamp (seconds or ms) to an ISO 8601 date string.
Inputs: input (required), unit, zone.
Decode percent-encoded URL text.
Inputs: input (required), mode.
Percent-encode a string (component or full URI mode).
Inputs: input (required), mode.
Generate RFC 4122 v4 UUIDs.
Inputs: count.
Pretty-print YAML.
Inputs: input (required), indent, sortKeys, lineWidth.
Convert YAML to pretty-printed JSON.
Inputs: input (required).
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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19 zero-setup utilities: JSON, regex, cron, hash, base64, CSV, JWT, UUID, YAML, semver, time.
22 developer utilities: base64, hashes, JWT, JSON tools, unit conversion. Free, keyless.
31 deterministic tools: JSON→Zod, regex, JWT, curl→fetch, hashing, encoding, UUIDs, encrypted links
105 tools: JSON repair, CSV, hashes, cron, dates, units, validators. 25 free calls.
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