Free Online Tools That Just Work
A growing collection of free, fast, privacy-friendly online tools. No sign-up, no uploads, no tracking of your data — everything runs in your browser.
Latest Tools
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Button Size Chart
Lay a button on the screen to find its ligne size, plus the full ligne-to-mm chart.
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Hash Generator for Excel
Hash a column with SHA-256, SHA-1 or MD5, or encode/decode a URL — no VBA required.
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JSON to Google Sheets
Paste JSON, flatten nested objects and arrays, and copy a table straight into Sheets.
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Fabric Count Gauge
Hold unmarked Aida or evenweave against a calibrated grid to find its count.
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Socket Size Gauge
Hold a bolt head against a true-scale hex outline to identify its size.
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Quilt Binding Calculator
How much binding fabric you need, with mitre allowance and a to-scale cutting diagram.
Measurement
View All →Rulers, converters, and sizing tools that work right in your browser.
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Online Ruler
An accurate on-screen ruler in centimetres, inches, and pixels.
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Crochet Hook Size Chart
Identify an unmarked hook by holding it against your screen, plus the full mm-to-US chart.
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Knitting Needle Size Chart
Identify an unmarked needle against your screen, plus the full US-to-mm chart.
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Beads Per Inch
How many beads fill an inch, plus a true-size gauge to identify what you have.
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Sandpaper Grit Chart
CAMI, FEPA and JIS grits against actual particle size — including where they disagree.
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Fabric Count Gauge
Hold unmarked Aida or evenweave against a calibrated grid to find its count.
Calculators
View All →Fast, single-purpose calculators with no sign-up required.
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Minutes to Decimal
Turn hours and minutes into the decimal hours a timesheet expects.
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Paper Size Scale Calculator
The exact percentage to type into your print dialog, with both sheets to scale.
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Quilt Binding Calculator
How much binding fabric you need, with mitre allowance and a to-scale cutting diagram.
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Swim Laps to Miles
How many lengths make a mile in your pool, and why a lap is not a length.
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Wallpaper Roll Calculator
Accounts for pattern-repeat waste and half-drop match, not just wall area.
Text
View All →Counters, formatters, converters, and cleaners for text.
Images
View All →Resize, convert, and inspect images without uploading them anywhere.
Developer
View All →Encoders, formatters, and generators for everyday development work.
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Base64 Decode for Excel
Decode a Base64 cell to text or back to the original file, without a macro.
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Hex to RGB for Excel
Hex, R/G/B, the RGB() formula, and the reversed BGR long Excel actually stores.
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Hash Generator for Excel
Hash a column with SHA-256, SHA-1 or MD5, or encode/decode a URL — no VBA required.
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Unix Timestamp to Excel Date
Epoch seconds to an Excel serial and back, with the 1900 bug and 1904 Mac offset.
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JSON to Google Sheets
Paste JSON, flatten nested objects and arrays, and copy a table straight into Sheets.
Why These Tools Are Different
Every tool here runs entirely in your browser. Nothing you type, paste, or measure is uploaded to a server, because there is no server doing the work — the page itself does it on your device.
There is no sign-up, no email wall, and no trial. Each tool loads in well under a second, works on a phone as well as a laptop, and has a dark mode. If a tool ever feels slower or clumsier than the alternative, that is a bug worth reporting.
Suggest a Tool
Missing something? Tell us what you need — most of these tools exist because someone had a small, specific problem and could not find a decent way to solve it.