44 fast, no-nonsense developer & network tools — free, no sign-up, nothing tracked. Most run entirely in your browser.
Send a real email to a throwaway address and get a spam score with exactly what's wrong — SPF/DKIM/DMARC, blacklists and content.
live$ mailOne-shot mail health score for a domain: MX, SPF, DMARC, DKIM, the MX host's reverse DNS and blacklist status, graded A–F.
live$ digResolve A, AAAA, MX, TXT, NS, CNAME and SOA records for any domain.
live$ sslInspect a host's live certificate: expiry, issuer, SANs, chain and trust. Private targets are refused.
local$ pwgenCryptographically-strong random passwords with full control over length and character sets.
local$ icoMake a favicon from letters or an emoji — colours, shape, live previews, PNG / SVG download.
local$ jsonPretty-print, minify and validate JSON, entirely in your browser.
live$ whoisRegistration data for a domain or IP via RDAP: registrar, status, key dates and nameservers.
local$ b64Encode or decode Base64, UTF-8 safe. Nothing leaves the page.
local$ jwtDecode a JSON Web Token's header and payload and read its exp / iat claims. Signature not verified.
local$ dateConvert between Unix epoch (seconds / milliseconds) and human-readable dates.
local$ shaCompute SHA-1 / SHA-256 / SHA-384 / SHA-512 digests of any text, in your browser.
local$ uuidGenerate one or many RFC-4122 v4 UUIDs. Copy with a click.
local$ urlencPercent-encode or decode text, in component or full-URL mode. Nothing leaves the page.
live$ ipYour public IPv4 / IPv6 as seen by the server, plus the request headers behind it.
live$ spfLook up a domain's SPF record, parse its mechanisms and flag the 10-lookup limit.
live$ curl -IFetch a URL and read its status, response headers, redirect chain and timing. SSRF-guarded.
live$ ttfbProbe a URL up to 30 times, a second apart, and watch time to first byte live: spikes, jitter and CDN cache hit or miss.
live$ pingCheck whether a website is up or down, with HTTP status and response time.
live$ ncTest whether a TCP port is open on a host — open / closed / filtered, with the resolved IP and connect time.
local$ reTest a JavaScript regular expression against sample text with live match highlighting and capture groups.
live$ mxList a domain's mail servers by priority and resolve each to its A / AAAA addresses.
live$ dmarcResolve and parse the _dmarc policy, with warnings for p=none, missing rua and partial pct.
live$ dkimFetch a DKIM public key by selector and flag revoked (empty p=) or test-mode keys.
live$ propQuery several public resolvers and compare answers to see if a DNS change has propagated.
live$ rblCheck an IPv4 (or a domain's A record) against ~10 DNS blacklists like Spamhaus and SpamCop.
local$ yamlConvert between JSON and YAML, both directions, in your browser.
local$ diffCompare two blocks of text line by line and highlight what was added or removed.
local$ cronValidate a cron expression and preview its next run times in your local timezone.
local$ cidrIPv4 CIDR breakdown: network, broadcast, netmask, wildcard, host range and usable count.
local$ wcCount characters, words, lines, sentences and paragraphs, with a reading-time estimate.
local$ caseConvert between UPPER, lower, Title, camelCase, snake_case, kebab-case and more, with live counts.
local$ qrTurn any text or URL into a QR code with selectable error correction. Download PNG or SVG.
live$ ptrPTR lookup with forward-confirmed reverse DNS (FCrDNS) — the check mail servers run on a sender's IP.
local$ hdrPaste raw email headers to see the delivery hop timeline with delays, SPF/DKIM/DMARC results and key fields. All local.
local$ chmodBuild Unix file permissions from checkboxes — octal, symbolic and the chmod command, both ways.
local$ baseConvert integers between binary, octal, decimal, hex and any base 2–36. Arbitrary precision.
local$ totpGenerate a 2FA secret, a scannable provisioning QR and a live one-time code. All local.
local$ wordsMemorable diceware-style passphrases from a curated wordlist, with a live entropy estimate.
local$ ogGenerate SEO + Open Graph + Twitter meta tags with a live social-share preview.
local$ hueGenerate harmonious colour palettes (analogous, complementary, triad, mono). Click to copy hex.
local$ barcodeGenerate CODE128, EAN-13/8, UPC, CODE39 and ITF-14 barcodes. Download PNG or SVG.
local$ ulidGenerate time-sortable ULIDs and UUID version 7 identifiers, locally.
local$ loremPlaceholder text by paragraphs, sentences or words.
invoker.tools is a growing toolbox of fast utilities for developers, sysadmins and technical users: network and DNS lookups, email-deliverability checks (SPF, DKIM, DMARC, MX), TLS certificate inspection, generators for passwords, UUIDs, QR codes and barcodes, plus encoders, converters and text helpers. There is nothing to install and no account to create.
Privacy is the default. Client-side tools process your input entirely in your browser, so it never leaves your device. The few server-side tools only perform the public DNS or TLS lookup they need and store nothing.
Yes. Every tool on invoker.tools is free to use with no sign-up, no account and no usage limits.
Most tools run entirely in your browser, so your input never leaves your device. A few network tools (DNS, SPF, SSL and similar) perform a lookup on the server because they have to query public DNS or connect to a host.
Generators, encoders, converters and text tools are client-side and process everything locally. Tools marked “live” do a server-side DNS lookup or TLS connection.
No. Everything works in a normal web browser on desktop or mobile — there is nothing to download or install.
No ads and no third-party trackers. The toolbox is built by invoker as a clean, fast utility set.
Yes. The collection grows regularly with new developer and network tools across the existing categories.