Everyday Tools

Development & Design Tools

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32 free tools

32 tools.

Development·design
76 / development·design

JSON sort·verifier

JSON check syntax and clean up indentation or compression format

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77 / development·design

JSON→CSV converter

Convert an object array into a CSV table with column names.

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78 / development·design

CSV→JSON converter

Use the first row header as a key to convert it into a CSV JSON array.

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79 / development·design

Base64 encoding·decoding

Converts UTF-8 text to standard Base64 or restores it to original form.

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80 / development·design

URL encoding and decoding

Encode or restore special characters in URL components in percent format.

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81 / development·design

HTML special character conversion

Converts five special characters in HTML into or restores as entities.

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82 / development·design

Unicode escape conversion

Convert or restore a string to UTF-16 \uXXXX format.

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83 / development·design

Text·hexadecimal conversion

Represents text in UTF-8 bytes as hexadecimal or converts it back to text.

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84 / development·design

Number Base Converter

Converts an integer to a binary representation 2·8·10·16.

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85 / development·design

HEX·RGB·HSL converter

Convert 6-digit HEX colors to RGB and HSL.

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86 / development·design

Color contrast checker

Check the WCAG compliance and AA·AAA text standards for the two HEX colors.

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87 / development·design

CSS gradient generator

Create a CSS linear gradient code using two colors and angles.

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88 / development & design

CSS shadow generator

Generates box-shadow code using horizontal/vertical movement, opacity, and spread values.

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89 / development & design

Screen ratio size calculator

Calculates a new height while maintaining the original width and height ratio.

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90 / development & design

Screen PPI Calculator

Calculates pixel density of the screen using pixel resolution and screen diagonal inch.

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91 / development & design

Responsive CSS clamp generator

Generates dynamic font size CSS based on the text width of two screens.

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92 / development & design

Query string parser

Decodes key and value in URL query, and identifies duplicate keys as an array.

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93 / development & design

URL structure analyzer

破 down the web address into protocol·host·port·path·query·hash.

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176 / development·design

IPv4 subnet calculator

Check network, mask, address range, and host count using IPv4 address and CIDR prefix.

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103 / Development·Design

Create QR code

Create a QR code for address, text, Wi-Fi, and contact info, then save as PNG or SVG. The input is processed by the browser.

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121 / Development·Design

Regular expression test

Check JavaScript regular expression matching, capture groups, and substitution. Stop for slow patterns and process input in the browser.

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122 / Development·Design

JWT content verification

JWT check header, payload, expiration, and issuance time. No tokens are stored or transmitted; signature verification is not performed.

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123 / Development·Design

JSON structure comparison

Compare JSON additions, deletions, and changes without ignoring object key order and spaces. Also check differences in array positions and large numbers.

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124 / Development·Design

Creates UTM link.

Enter source, medium, and campaign to create a tracking link. Verify the replacement UTM content and copy the completed URL

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125 / Development·Design

YAML·JSON conversion

Convert YAML to JSON bidirectionally. Preserve large numbers and check types, aliases, and annotations that cannot be converted to JSON.

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126 / Development·Design

SQL Formatter

Sort SQL according to PostgreSQL·MySQL dialects. Adjust indentation and keyword case, but no query is executed.

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127 / Development·Design

Markdown preview

Check the Markdown document on the screen and save as HTML or MD. No user HTML is executed, and external images are not loaded.

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128 / Development·Design

Create a Markdown table

Paste tables from Excel or spreadsheets and edit cells. Select column alignment and copy or save the Markdown table.

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141 / Development and Design

Read QR code in a photo

Read and copy QR content from screenshots or photos, or save as TXT. Read address and Wi-Fi information in the browser without automatic execution.

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142 / Development and Design

Create barcode

Generate CODE128·EAN-13·EAN-8·UPC-A barcodes and save as PNG·SVG. Check the check numbers and prepare the image for printing.

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192 / development·design

Cron Expression Generator

Executed every minute·every hour·every day·every day·every month as a Unix 5-field cron job. The following execution example is checked using the device’s time zone.

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197 / development·design

View·edit CSV table editor

Open CSV·TSV files as a table to search·edit and save. Guides formatting content for UTF-8·EUC-KR and delimiters.

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