Developer Tools
A comprehensive collection of free online tools for developers. Convert, encode, calculate, and more — all in your browser.
Popular Tools
SPA
Base64 Encode/Decode
Encode and decode Base64 strings.
base64
encode
decode
SPA
Color Picker
Pick a color and convert it to any format.
color
picker
hex
rgb
SPA
CSV Viewer
Parse and display CSV data in a table format.
csv
viewer
parser
table
sql
CVE Explorer
Fetch details for a specific Common Vulnerabilities and Exposures (CVE) ID.
cve
vulnerability
security
lookup
SPA
Dockerfile Builder
Visually create and edit Dockerfiles without writing code.
docker
dockerfile
container
build
Fuzzy Domain Finder
Generate and analyze variants of a domain name to find potential phishing or typosquatting threats.
phishing
typosquatting
domain
security
fuzzer
Coming Soon
HTML to PDF
Convert a webpage or raw HTML into a downloadable PDF.
html
pdf
converter
webpage
Image Converter
Convert images between formats like PNG, JPEG, WebP, and GIF.
image
convert
format
SPA
IP Information
Lookup IP address geolocation and details.
ip
geolocation
lookup
SPA
jq Playground
A playground for the jq command-line JSON processor.
jq
json
filter
query
parser
SPA
JSON ↔ CSV
Convert data between JSON and CSV formats.
json
csv
convert
SPA
JSON ↔ XML
Convert data between JSON and XML formats.
json
xml
convert
SPA
JSON Formatter
Format, validate, and beautify your JSON data.
json
format
validate
beautify
SPA
JWT Encoder/Decoder
Encode and decode JSON Web Tokens.
jwt
token
decode
Known Bot Checker
Check if an IP address belongs to a known bot or service.
bot
crawler
spider
ip
security
LLM Model Explorer
Browse and compare features of different Large Language Models.
llm
ai
model
gpt
gemini
claude
cost
pricing
SPA
Markdown Viewer
View and render Markdown to HTML, with download options.
markdown
preview
html
Mock Data Generator
Create realistic mock data by type or from a schema using AI.
mock
data
json
api
SPA
Mortgage Calculator
Calculate your monthly mortgage payments.
loan
interest
payment
finance
SPA
Password Generator
Create strong, secure, and random passwords.
password
security
generator
SPA
Prompt Library
A collection of curated, optimized prompts for various LLM tasks.
prompt
library
llm
ai
generator
template
Prompt Optimizer
Refine and shorten your LLM prompts with AI to reduce token usage.
prompt
llm
ai
optimize
token
cost
SPA
QR Code Generator
Generate QR codes from text or URLs.
qr
code
generator
Regex Tester
Test and debug regular expressions, with AI assistance.
regex
test
debug
Sentiment Analyzer
Analyze the sentiment and emotions within a block of text.
sentiment
text
ai
nlp
SPA
Share Secret
Share a secret with a password-protected, encrypted link.
share
secret
encrypt
password
SPA
SIP/SWP Calculator
Plan your investments to meet future withdrawal needs.
sip
swp
investment
retirement
financial
SPA
SQL Playground
Run SQL queries against CSV data directly in your browser.
sql
csv
database
query
SPA
Stock Average Calculator
Calculate the average price of your stock holdings.
stock
average
price
finance
Stock Data
Fetch near real-time stock data for any ticker symbol.
stock
finance
ticker
SPA
Subnet Calculator
Calculate and visualize IP subnets.
subnet
ip
network
SPA
Time Converter
Compare times across multiple timezones visually.
time
timezone
convert
SPA
Timestamp ↔ Date
Convert between Unix timestamps and human-readable dates.
timestamp
date
time
epoch
SPA
Unit Converter
Convert between various units like length, mass, and temperature.
units
convert
length
mass
SPA
Vesting Schedule Calculator
Analyze and visualize your stock vesting timeline.
vesting
stock
options
rsu
financial tools
vesting schedule calculator
SPA
World Clock
View analog clocks for different timezones.
world
clock
time
timezone
All Tools
SPA
Base64 Encode/Decode
Encode and decode Base64 strings.
base64
encode
decode
SPA
Color Picker
Pick a color and convert it to any format.
color
picker
hex
rgb
SPA
CSV Viewer
Parse and display CSV data in a table format.
csv
viewer
parser
table
sql
CVE Explorer
Fetch details for a specific Common Vulnerabilities and Exposures (CVE) ID.
cve
vulnerability
security
lookup
SPA
Dockerfile Builder
Visually create and edit Dockerfiles without writing code.
docker
dockerfile
container
build
Fuzzy Domain Finder
Generate and analyze variants of a domain name to find potential phishing or typosquatting threats.
phishing
typosquatting
domain
security
fuzzer
Coming Soon
HTML to PDF
Convert a webpage or raw HTML into a downloadable PDF.
html
pdf
converter
webpage
Image Converter
Convert images between formats like PNG, JPEG, WebP, and GIF.
image
convert
format
SPA
IP Information
Lookup IP address geolocation and details.
ip
geolocation
lookup
SPA
jq Playground
A playground for the jq command-line JSON processor.
jq
json
filter
query
parser
SPA
JSON ↔ CSV
Convert data between JSON and CSV formats.
json
csv
convert
SPA
JSON ↔ XML
Convert data between JSON and XML formats.
json
xml
convert
SPA
JSON Formatter
Format, validate, and beautify your JSON data.
json
format
validate
beautify
SPA
JWT Encoder/Decoder
Encode and decode JSON Web Tokens.
jwt
token
decode
Known Bot Checker
Check if an IP address belongs to a known bot or service.
bot
crawler
spider
ip
security
LLM Model Explorer
Browse and compare features of different Large Language Models.
llm
ai
model
gpt
gemini
claude
cost
pricing
SPA
Markdown Viewer
View and render Markdown to HTML, with download options.
markdown
preview
html
Mock Data Generator
Create realistic mock data by type or from a schema using AI.
mock
data
json
api
SPA
Mortgage Calculator
Calculate your monthly mortgage payments.
loan
interest
payment
finance
SPA
Password Generator
Create strong, secure, and random passwords.
password
security
generator
SPA
Prompt Library
A collection of curated, optimized prompts for various LLM tasks.
prompt
library
llm
ai
generator
template
Prompt Optimizer
Refine and shorten your LLM prompts with AI to reduce token usage.
prompt
llm
ai
optimize
token
cost
SPA
QR Code Generator
Generate QR codes from text or URLs.
qr
code
generator
Regex Tester
Test and debug regular expressions, with AI assistance.
regex
test
debug
Sentiment Analyzer
Analyze the sentiment and emotions within a block of text.
sentiment
text
ai
nlp
SPA
Share Secret
Share a secret with a password-protected, encrypted link.
share
secret
encrypt
password
SPA
SIP/SWP Calculator
Plan your investments to meet future withdrawal needs.
sip
swp
investment
retirement
financial
SPA
SQL Playground
Run SQL queries against CSV data directly in your browser.
sql
csv
database
query
SPA
Stock Average Calculator
Calculate the average price of your stock holdings.
stock
average
price
finance
Stock Data
Fetch near real-time stock data for any ticker symbol.
stock
finance
ticker
SPA
Subnet Calculator
Calculate and visualize IP subnets.
subnet
ip
network
SPA
Time Converter
Compare times across multiple timezones visually.
time
timezone
convert
SPA
Timestamp ↔ Date
Convert between Unix timestamps and human-readable dates.
timestamp
date
time
epoch
SPA
Unit Converter
Convert between various units like length, mass, and temperature.
units
convert
length
mass
SPA
Vesting Schedule Calculator
Analyze and visualize your stock vesting timeline.
vesting
stock
options
rsu
financial tools
vesting schedule calculator
SPA
World Clock
View analog clocks for different timezones.
world
clock
time
timezone
SPA
API Rate Limit Calculator
Calculate and visualize API rate limits across different time windows.
rate
limit
api
capacity
SPA
Auto Loan Calculator
Estimate your monthly car loan payments.
auto
car
loan
vehicle
finance
SPA
Bandwidth Calculator
Estimate data transfer times based on file size and network speed.
bandwidth
speed
transfer
network
SPA
Binary ↔ Text
Convert text to binary code and vice versa.
binary
text
convert
SPA
Calculator
A simple calculator for basic arithmetic.
math
arithmetic
basic
SPA
Case Converter
Convert text between different case styles like camelCase, snake_case, etc.
text
case
convert
format
SPA
Cloud Explorer
Visually explore cloud provider regions and availability zones.
cloud
aws
gcp
azure
region
zone
SPA
Coin Flip & Dice Roll
Quickly generate a random result for a coin flip or a dice roll.
coin
dice
random
generator
SPA
Color Palette Picker
Generate and explore harmonious color palettes.
color
palette
design
SPA
Compound Interest Calculator
Calculate compound interest on an investment.
loan
interest
payment
finance
SPA
Countdown Clock
Set a timer that counts down to zero.
timer
countdown
clock
SPA
Credit Card Generator
Generate valid test credit card numbers.
credit
card
generator
SPA
Cron Job Explainer
Translate cron schedule strings into human-readable descriptions.
cron
schedule
job
SPA
CSP Generator
Generate Content Security Policy headers.
csp
security
header
SPA
Find and Replace
Find and replace text within a larger body of content.
find
replace
string
text
SPA
Folder Map Generator
Select a folder to generate a text-based tree map of its contents.
folder
directory
tree
map
structure
SPA
Grok Debugger
Parse and debug Grok patterns against log data.
grok
log
parse
SPA
Hash Generator
Generate hashes (MD5, SHA-1, SHA-256, etc.).
hash
md5
sha256
Image Resizer
Resize and compress JPEG, PNG, and WebP images to reduce file size.
image
resize
compress
IP Address Generator
Generate random IP addresses for a specified country.
ip
generator
network
SPA
JSON ↔ TOML
Convert data between JSON and TOML formats.
json
toml
convert
SPA
JSON ↔ YAML
Convert data between JSON and YAML formats.
json
yaml
convert
SPA
JSON Modifier
Selectively filter keys from a JSON object.
json
filter
keys
remove
select
edit
SPA
LLM Shield
Obfuscate text to make it difficult for AI to parse while remaining human-readable.
llm
ai
obfuscate
protect
content
SPA
Lorem Ipsum Generator
Generate placeholder text in words, sentences, or paragraphs.
lorem
ipsum
text
placeholder
MAC Address Generator
Generate random MAC addresses with custom formats.
mac
address
network
SPA
Number Picker Wheel
A spinning wheel to pick a random number from a range.
random
number
picker
wheel
generator
OTP Generator
Generate and verify Time-Based One-Time Passwords (TOTP).
otp
2fa
mfa
auth
security
generator
SPA
Percentage Calculator
Calculate percentages, fractions, and discounts.
percentage
math
calculator
SPA
Profit/Loss Calculator
Calculate profit or loss from a transaction, including margin and ROI.
profit
loss
roi
margin
finance
SPA
RAID Calculator
Calculate storage capacity and redundancy for various RAID levels.
raid
storage
disk
capacity
SPA
RSA Key Generator
Generate public and private RSA key pairs.
rsa
key
security
Security Headers Checker
Analyze HTTP response headers for security.
http
headers
security
SPA
Set Operations
Perform set operations like union and intersection on two lists.
set
union
intersection
difference
SPA
Sort List
Sort a list of items alphabetically, by length, or randomly.
sort
list
order
arrange
SPA
SQL Formatter
Format and beautify your SQL queries.
sql
format
query
database
SPA
SRI Hash Generator
Generate Subresource Integrity hashes for scripts and stylesheets.
sri
hash
security
SPA
Stopwatch
Measure elapsed time with lap functionality.
timer
stopwatch
laps
SPA
String Escape / Unescape
Escape or unescape strings, including Unicode sequences.
string
escape
unescape
unicode
SPA
String Reverser
Reverse the characters in any given string.
string
reverse
text
SPA
Text Diff Checker
Compare two text files and highlight the differences.
text
diff
compare
SPA
Text Statistics
Count characters, words, sentences, lines, and paragraphs.
text
statistics
word count
SPA
Text to ASCII Art Generator
Convert plain text into ASCII art using various fonts.
text
ascii
art
generator
figlet
TLS/SSL Certificate Checker
Check a domain's SSL/TLS certificate details.
tls
ssl
certificate
Token Counter
Estimate the token count for text with various LLM models.
llm
token
gpt
gemini
claude
cost
Uptime Checker
Check if a website is online and view its status in real-time.
uptime
ping
status
monitoring
http
latency
SPA
Uptime/Downtime Calculator
Calculate service uptime and downtime based on SLA percentages.
uptime
downtime
sla
slo
sli
availability
sre
SPA
URL Encode/Decode
Encode and decode strings for URL-safe usage.
url
encode
decode
SPA
User-Agent Utility
Parse, analyze, and generate User-Agent strings.
user-agent
parser
generator
SPA
UUID Generator
Generate universally unique identifiers.
uuid
guid
generator
SPA
YAML ↔ TOML
Convert data between YAML and TOML formats.
yaml
toml
convert