All Tools
23 tools, all running in your browser — nothing gets uploaded, no account needed, and most keep working after you go offline.
Developer Tools
JSON Formatter
Format, minify and validate JSON, with syntax errors pinned to the exact line.
UUID Generator
Generate RFC 4122 version 4 UUIDs in bulk from a cryptographically secure source.
XML Formatter
Format, indent and validate XML, with parse errors reported inline.
XML to JSON
Convert XML into JSON, with attributes preserved and repeated tags collapsed into arrays.
JSON to XML
Convert JSON into well-formed XML, turning @-prefixed keys back into attributes.
YAML to JSON
Convert YAML config into JSON, with anchors and multi-line strings resolved.
JSON to YAML
Convert JSON into readable YAML for config files, manifests and CI pipelines.
Epoch Converter
Convert Unix timestamps to dates and back, in seconds or milliseconds.
Diff Checker
Compare two texts line by line and see exactly what changed.
Base64 Decode
Decode Base64 to text or encode it back, with UTF-8 and URL-safe handled properly.
Image Tools
Text Tools
Chart Makers
Histogram Maker
Paste a column of numbers and get a histogram, with bin count you control.
Pie Chart Maker
Turn a list of labels and numbers into a pie chart with percentage labels.
Venn Diagram Maker
Draw a two or three set Venn diagram sized by how big each set is.
Line Graph Maker
Plot one or more series over time and see the trend, gaps included.
Box Plot Maker
Compare groups by median, quartiles and outliers using the 1.5×IQR rule.
Scatter Plot Maker
Plot X against Y to see whether two measurements move together.
Bar Chart Maker
Compare categories side by side, with grouped bars and a zero baseline.
Gantt Chart Maker
Lay tasks on a timeline with start and duration, milestones included.
Org Chart Maker
Turn an indented list of names into a clean reporting structure.
Looking for something else?
Unit conversion tools live on the converters page, alongside individual pages for hundreds of commonly looked-up values.