This website contains a bunch of web-based tools (you don't need to install anything, just run them here) that I have developed through the years. Use them like you want (within reason) and if you really like them, let me know.

Recent blog posts

Bash script generator with bashew (Dec 30) • I have archived my project bash_boilerplate and started a better one with pforret/bashew. I have worked a lot on bashew… (Code, bash, generator, script, shell)
Music scale generator (Nov 2) • A second tool I made this weekend solves a problem I have been thinking about since my first Commodore 64,… (Music, blues, frequency, intonation, pentatonic, scale, tuning)
Frequency to musical note converter (Nov 2) • I worked on some new musical tools this weekend and this is the first one: a calculator to convert hertz… (Music, audio, engineer, frequency, hertz, note, sound)
Check your Sender Policy Framework (SPF) (Jul 31) • I have created an easy tool to check your SPF configuration (what is specified in your DNS config about what… (Network, email, security, smtp, spf)
Calculate foot-lambert luminance on a screen (Jul 22) • In the projection business, there is a unit for ‘how much light is coming from that screen, actually?’. This is… (Video, cinema, lumen, luminance, power, screen)
Big website layout upgrade (Jun 5) • I finally got around to do a big upgrade of this site: upgrade to Bootstrap/Bootswatch 4.5 upgrade to Fontawesome 5.9… (Website, bootstrap, css, layout, mobile, responsive, speed)

How could you use these tools?

How big is a 15-minute 1080p25 movie in ProRes 4444?
Click on video >> bitrates
Look up 1080p25: 275 Mbps. Click on the 2.06 GB/min and fill in 15 minutes. This adds up to 30.9 GB!
Click here for more examples

Calculator tools

Acceleration calculator
Convert m/s² into in/s², g
Distance calculator
Speed x time → distance
Electric Car calculator
How much $ does your electric car use in kWh per year?
Exponential growth
Exponential growth / logarithmic decay
Fuel Cost calculator
How much $ does your car fuel cost per year?
Gladwell's 10000 hours
Deliberate practice according to Malcolm Gladwell
Speed converter
m/s ⇆ km/h, mph, mach
Bandwidth convert
Mbps ⇆ KB/s, GB/day, TB/week ...
Download calculator
file size & network speed ⇆ time to download
Data size calculator
Calculate 10 Mbps x 6.5 hours = ? GB
Frequency Calculator
Hertz -> wavelength, spectrum
Electrical power
Volt x Amp → Watt, kWh, Ah, Joule, calorie
Wavelength Calculator
Wavelength -> Hz, spectrum
Mortgage loan calculator
Calculate monthly payments for a mortgage loan

Color tools

CMYK conversion
HTML Color list
List of named HTML colors
Pantone Color list
List of named Pantone colors
RGB conversion
Websafe Color list
List of websafe colors

Data tools

Bash boilerplate
Create bash scripts fast with a slick boilerplate

Music tools

Convert BPM to Hz, bar length, fractions
Audio delay
Calculate audio delay length in msec
Music Frequency
Convert pitch to musical note and wavelength
Song length
Calculate song length from BPM
Music Scale
Generate scales with frequencies
Tap your tempo
Tap to find the BPM of a song or a heartbeat

Photo tools

Aspect ratio
Image Width x Height → aspect ratio
Composition Calculator
Focal length, distance, crop factor → image composition
Depth-of-Field Calculator
Aperture, focal length, subject distance, crop → depth-of-field
DPI calculator
Print Width x Height and dpi → megapixels
Image filesize calculator
Image Width x Height JPG/RAW/PNG → bytes
Light calculator (EV)
Aperture, shutter time, ISO → Exposure Value
Megapixel calculator
Image Width x Height → megapixels
Megapixel Aspects
See megapixels in different aspect ratios

Video tools

Audio file size calculator
Estimate audio file size for (un)compressed audio
Common bitrates
List of common video bitrates (Prores, DV, DCP, MPEG...)
DCP file size
Calculate DCP audio and video filesizes
Foot-Lambert Calculator
Foot-Lambert Calculator for luminance of a screen
Screen size
Calculate screen size from diagional and aspect ratio
Video bitrate
Estimate video bitrate based on resolution, fps and bit depth
Frame rate convert
Framerate conversion with ffmpeg and sox
Video file size calculator
Estimate video file size from resolution and duration

Web tools

Content Security Policy
Create your Content Security Policy header fast!
Redirection check
Is your site redirection correctly configured?
Security Policy Framework check
Is your SPF correctly configured?
HTTPS config check
Is your site correctly configured for HTTPS?
HTML char map
View all special HTML characters «»
Emoji char map
View all special Unicode characters 🥠
HTML encoder
(HTML/URL) Encode text full of àçčéñtš
SEO Performance
Check your site on 10+ performance test sites

About this site

Development blog
New tools and other announcements
Remarks about this site? Let me know!
How grew since 2006 until now
Privacy Statement
Privacy statement (GDPR compliant)
Terms & Conditions
Terms & conditions
How to use the tools
Show me how I can use these tools