Free Online Tools
268+ free online tools for PDF, images, SEO, developers, color, and productivity. Fast, browser-based, and private — no signup, no installs, no limits. Search above or browse by category below.
Total tools26810.8K total uses
Categories13Active categories
Most usedJSON Formatter4.1K uses
Recently addedExperiment RandomizerNewest tool
RGB to CMYK
Convert RGB screen colors to CMYK print values with cyan, magenta, yellow, and key (black) percentages.
Used 1 times•Updated 30 minutes ago
Clip Path Generator
Design CSS clip-path shapes with live preview and copy-ready CSS, inline styles, and Tailwind classes.
Used 1 times•Updated 20 minutes ago
UUID Generator
Generate RFC 4122 UUID v4 identifiers in bulk with optional uppercase and hyphen formatting.
Used 1 times•Updated 25 minutes ago
RSA Decrypt
Decrypt RSA-OAEP JSON payloads with your private key, including hybrid RSA + AES-GCM ciphertext.
Used 1 times•Updated 13 minutes ago
Port Scanner
Scan common TCP ports on a public host — check which services are reachable from the server.
Used 1 times•Updated 4 minutes ago
Ping Test
Ping a hostname or IP from the server. Check reachability, packet loss, and round-trip latency.
Used 1 times•Updated 4 minutes ago
HTML Formatter
Format and beautify HTML markup with indentation, readable tag breaks, and optional minification.
Used 1 times•Updated 42 minutes ago
Protein Calculator
Estimate daily protein needs from body weight, training goals, and meal count with per-meal targets.
Used 1 times•Updated 22 minutes ago
Unsloth Dataset Builder
Unsloth dataset builder free — create fine-tuning JSONL for Alpaca, chat messages, tool calls, or raw text. Import, validate, split train/eval, export.
Used 1 times•Updated 30 minutes ago
Mole Calculator
Mole calculator free — convert between grams, moles, and particles using molar mass. Instant chemistry stoichiometry in your browser, no signup.
Used 1 times•Updated 32 minutes ago
Normality Calculator
Normality calculator free — convert N, molarity, and equivalents per mole. Find normality from mass and volume. Chemistry titration prep in your browser.
Used 1 times•Updated 32 minutes ago
Percent Yield Calculator
Percent yield calculator free — find % yield, actual yield, or theoretical yield in grams or moles. Stoichiometry lab prep, no signup.
Used 1 times•Updated 22 minutes ago