Browse all 1551 free tools across 32 categories
Check whether a number is abundant: smaller than the sum of its proper divisors. Exact Big
Generate abundant numbers: n with sigma(n) > 2n, where divisors overflow: 12, 18, 20, 24,
Add errors to numbers - corrupt them so they are nearly identical but slightly wrong: swap
Generate almost perfect numbers: n with sigma(n) = 2n - 1, all known examples being powers
Free number analyzer. Paste any whole number and instantly see digit frequency, prime stat
Quickly generate an arithmetic progression (AP) series. Enter the starting number, common
Add Errors to ASCII - Simulate Data Damage
Add Typos to ASCII - Simulate Keyboard Typos
AND ASCII Characters browser-based ASCII utility.
Edit ANSI art with a safe terminal-style preview for common SGR colors.
Remove common ANSI styling sequences and keep the underlying text.
Convert numeric values from base 2 through 36 into ASCII characters in your browser. Valid
Generate a valid Kubernetes Pod (v1) with nodeAffinity and podAntiAffinity rules in your b
Generate an az aks create command for Azure Kubernetes Service in your browser. Configure
Check pasted Kubernetes manifests for deprecated or removed apiVersions against a target K
Paste Ingress, Service and Deployment manifests and generate an ASCII architecture diagram
Encode and decode Base64 entirely in your browser. Useful for building Kubernetes Secret d
Calculate IPv4 CIDR network info client-side: network address, netmask, wildcard, broadcas
Generate OpenTofu terraform backend blocks (local, s3, gcs, azurerm, remote and more) as H
Build OpenTofu (tofu) commands with var, auto-approve, parallelism, target and other flags
Generate a Terraform provider scaffold in your browser: a terraform required_providers blo
Paste Terraform (.tf) and a .tfvars file to find variables without defaults that are not s
Build a terraform apply command with -auto-approve, -target, -var-file, -var and more. Cop
Paste Terraform .tf and generate a Mermaid architecture diagram showing how resources flow
Strip ANSI escape and color codes from terminal logs to get clean plain text. Removes CSI/
Parse Apache Common Log Format (CLF) and the Combined Log Format directly in your browser.
Convert Apache access logs (CLF and Combined format) and error_log lines into clean JSON r
Analyze Apache and Nginx error logs: auto-detect format, extract severity and message, cat
Turn delimiter-separated audit lines into clean, column-aligned tables with named fields,
Parse AWS CloudTrail event JSON: flatten event time, service, action, identity and source
Convert ASS/SSA (Advanced SubStation Alpha) subtitles to plain SRT. Strips styling and ove
Free auto subtitle generator. Transcribe a video or audio file to SRT, VTT or plain text w
Free background/outline style generator. Build an ASS style snippet with outline, shadow a
Free bilingual subtitle merger. Stack two language SRTs into one dual-subtitle file aligne
Free bilingual subtitle splitter. Separate a dual-subtitle SRT into two single-language SR
Free subtitle BOM tool. Add or remove the UTF-8 byte order mark from SRT files for compati
Convert Apache .htaccess rewrite, redirect and access-control rules into equivalent Nginx
Convert an Apache VirtualHost block into an Nginx server block with server_name, root, pro
Generate an nginx server and location with auth_basic and auth_basic_user_file referencing
Generate an nginx http block with brotli on, brotli_comp_level, brotli_types and brotli_bu
Compute proxy_buffer_size, proxy_buffers, client_body_buffer_size and client_max_body_size
Recommend proxy_cache_path size and keys_zone from a cache budget, with a conf snippet. Va
Generate Azure Container Registry (ACR) push commands: az acr login, docker tag, docker pu
Compare common Docker base image sizes: alpine vs slim vs full for node, python, ubuntu, d
Look up known vulnerabilities for Docker base images via the free OSV API (osv.dev). Offli
Generate a Google Cloud Run deploy command from a Dockerfile: gcloud builds, deploy flags
Check docker-compose.yml for secret exposure: plaintext environment passwords, tokens, env
Visualize docker-compose services and dependencies: parse depends_on, render ASCII tree an
Build an AWS ARN field by field — partition, service, region, account, resource type and i
Paste a list of AWS ARNs, one per line, and get a searchable table of partition, service,
Paste two AWS ARNs and see a field-by-field diff of partition, service, region, account, r
Paste an AWS ARN and a target 12-digit account id and get back the same ARN with only the
Paste an AWS ARN and instantly see its partition, service, region, account id, resource ty
Paste an AWS ARN and get a plain-English resource type label (IAM Role, Lambda Function, D
Build branch names from a configurable convention (type, scope, ticket, description), gene
Generate a CODEOWNERS file with pattern paths, teams, and user owners. Supports GitHub, Gi
Create a clear CONTRIBUTING.md for your repository in your browser — how to report bugs, r
Build a perfect Conventional Commits message in your browser — pick the type, add an optio
Create reusable git aliases from a library of useful shortcuts: pretty log, unstage, last,
Git Blame Formatter & Viewer. Parse pasted git blame output into a structured table with c
Convert AWS EventBridge cron() expressions into standard 5-field Unix cron when the source
Create schedules limited to configurable business hours on selected weekdays, including in
Check a specific date against a cron schedule and list the exact matching times for that d
Calculate how daylight-saving transitions affect upcoming cron executions in a chosen time
Audit a cron schedule for daylight-saving transitions and identify potentially shifted loc
Cron Environment Variable Generator - Generate environment variable declarations for cront
Model a US Section 1031 like-kind exchange: realized and recognized gain, depreciation rec
Generate a full month-by-month amortization schedule: payment, principal, interest and rem
Convert area between square feet, square meters, square yards, square inches, square centi
Calculate the tons of hot-mix asphalt and aggregate base for driveways, roads, paths and p
Estimate bathroom or kitchen remodel cost by room size, finish tier and itemized component
Calculate the number of bricks, mortar volume, cement bags, sand quantity, and total cost
Add subtle errors to an XML document — broken tags, swapped quotes, truncated values — gre
Replace angle braces and quotes in XML with other characters — square brackets, braces, pi
Diff two XML documents line by line and see exactly what changed. Color-coded output shows
Decode a data: URL (base64 or percent-encoded) back into a readable, pretty-printed XML co
Free Base64 to XML decoder that accepts raw, wrapped or data-URL Base64, decodes UTF-8 and
Decode a Bencode string (BitTorrent encoding) back into a readable XML document with corre
Create realistic fake JSON API responses from a sample object: realistic names, emails, pr
Decode base64 to JSON instantly. Tolerates whitespace, data: URL prefixes and URL-safe var
Decode bencode (BitTorrent metainfo, tracker messages) into readable JSON: integers, byte
Decode a binary BSON document into readable JSON: int32, int64, double, strings, booleans,
Convert a CSV or TSV table into a JSON array of objects. Choose the delimiter, treat the f
Convert a JSON array of objects into a clean CSV table with headers. Choose the delimiter,
Calculate whether your A/B test results are statistically significant. Test subject lines,
Free CAN-SPAM compliance checklist generator. Audit your email program against every requi
Check your email campaigns against Canada's Anti-Spam Legislation (CASL). Run an interacti
Free countdown timer generator for email campaigns. Design an animated GIF countdown in yo
Check your custom domain email setup in seconds. Verify MX records, SPF, DKIM, and DMARC,
Free double opt-in confirmation email generator. Build a responsive, Outlook-safe confirma
Convert electrical current in amps to power in watts using voltage and, where applicable,
Estimate incident energy and the working-distance flash-hazard boundary for a low-voltage
Size an off-grid or backup battery bank from load, runtime and autonomy days, applying dep
Find the maximum one-way cable length for a given wire size, current, voltage and allowed
Check cable tray fill: enter tray width, height and type, then your cable diameters and qu
Total up to eight capacitors in series or parallel with mixed units, and get stored energy
Generate a clean, printable Bill of Exchange (draft) for export or import transactions. Ch
Draft a bill of exchange (trade draft) for documentary collections with automatic maturity
Create a printable draft bill of lading template with shipper, consignee, cargo, ports, ma
Find out how many units you must export to break even on a product line or export order. E
Prepare a draft certificate of origin with exporter, consignee, producer, transport, invoi
Create a professional commercial invoice for international shipments with line items, HS c
Convert a CSV file into a .env file with correct parsing: comma, semicolon or tab delimite
Find duplicate keys in a .env file: every repeated variable with all its line numbers, the
Scan a .env file for keys with empty, whitespace-only, or quoted-empty values. Each one is
Encode or decode individual .env values to and from base64, with whole-file batch mode, UT
Decrypt AES-GCM encrypted .env values (ENC: tokens) with a passphrase, right in the browse
Compare two .env files in one click: added, removed and changed keys with old vs new value
Estimate the boiler heating capacity a building needs from heat loss, floor area, insulati
Convert between BTU per hour and cubic feet per hour for natural gas and propane, with the
Size drain, waste and vent pipes from drainage fixture units (DFU), pipe context, slope an
Convert elevation and water column height to pressure and back. How many PSI does one foot
Size a closed-loop expansion tank from system volume, fluid type, temperature, system pres
Convert toilets, sinks, showers, bathtubs and floor drains into drainage fixture units (DF
Inject a tiny controlled syntax error into YAML so validators and error-handling code can
Decode standard Base64 back into UTF-8 YAML in your browser. Validate the encoded input, c
Encode YAML text as standard UTF-8 Base64 directly in your browser. Copy or download the e
Normalize YAML string scalars to double-quoted form using a browser-side YAML parser and s
Normalize YAML string scalars to single-quoted form directly in the browser, with YAML-saf
Convert supported YAML configuration data into a ready-to-paste PHP array with correct sca
Compress BMP files online for free — convert BMP to JPEG, PNG, or WebP for up to 99% file
Compress GIF images online for free — convert GIF to WebP, JPEG, or PNG for dramatic size
Compress any JPG, PNG or WebP image to under 100 KB in your browser. The tool searches enc
Compress any JPG, PNG or WebP image to under 10 KB in your browser. The tool searches enco
Compress any JPG, PNG or WebP image to under 150 KB in your browser. The tool searches enc
Compress any JPG, PNG or WebP image to under 1 MB in your browser. The tool searches encod
Encode or decode Base64 with full UTF-8 (unicode) support. Choose standard or URL-safe alp
Instantly convert text between uppercase, lowercase, sentence case, title case, camelCase,
Free emoji counter. Paste any text and instantly see how many emojis it contains — countin
Find and replace text instantly with support for regex, case matching, whole word, multi-p
Remove duplicate lines from text instantly. Supports case-insensitive matching, trim white
Remove empty lines, blank lines, whitespace-only lines, and extra spacing from text instan
Free container load and CBM calculator. Enter your cartons and get total cubic metres, how
Free container capacity and utilization calculator. Measure volume and payload efficiency
Free cubic weight and volumetric weight calculator. Work out dimensional weight per carrie
Free FCL vs LCL comparison calculator. Enter your rates and charges to find the exact brea
Free freight cost calculator for sea, air and road shipments. Enter your cartons and get c
Calculate air freight chargeable weight from actual weight, package dimensions, quantity,
Estimate demurrage and detention costs using free days, days used, daily rates, and contai
Estimate an LTL freight class from shipment dimensions, weight, and density. Get a plannin
Compare common shipping container dimensions and calculate estimated cargo fit by length,
Build campaign URLs with UTM parameters for Google Analytics. Supports utm_source, utm_med
Build UTM tracking URLs for Google Analytics. Generate links with utm_source, utm_medium,
Decode and extract UTM parameters from any URL. Analyze campaign tags, batch decode multip