diff --git a/readability.rkt b/readability.rkt
index 91df556..8a511b5 100644
--- a/readability.rkt
+++ b/readability.rkt
@@ -314,3 +314,28 @@
   ; (check-equal? (splitf-at* '("foo" " " "bar" "\n" "\n" "ino") whitespace?) '(("foo")("bar")("ino")))
   (check-equal? (splitf-at* '(1 2 3 4 5 6) even?) '((1)(3)(5))))
 
+
+;; convert a bytecount into a string
+(define/contract (bytecount->string bytecount)
+  (integer? . -> . string?)
+  (define (format-with-threshold threshold suffix)
+    ;; upconvert by factor of 100 to get two digits after decimal
+    (format "~a ~a" (exact->inexact (/ (round ((* bytecount 100) . / . threshold)) 100)) suffix))
+  
+  (define threshold-kilobyte 1000)
+  (define threshold-megabyte (threshold-kilobyte . * . threshold-kilobyte))
+  (define threshold-gigabyte (threshold-megabyte . * . threshold-kilobyte))
+  (define threshold-terabyte (threshold-gigabyte . * . threshold-kilobyte))
+  
+  (cond
+    [(bytecount . >= . threshold-terabyte) (format-with-threshold threshold-terabyte "TB")]
+    [(bytecount . >= . threshold-gigabyte) (format-with-threshold threshold-gigabyte "GB")]
+    [(bytecount . >= . threshold-megabyte) (format-with-threshold threshold-megabyte "MB")]
+    [(bytecount . >= . threshold-kilobyte) (format-with-threshold threshold-kilobyte "KB")]
+    [else (format "~a bytes" bytecount)]))
+
+
+;; for use inside quasiquote
+;; instead of ,(when ...) use ,@(when/splice ...)
+;; to avoid voids
+(define-syntax-rule (when/splice test body) (if test (list body) '()))
diff --git a/server-routes.rkt b/server-routes.rkt
index c8b24b4..b16e09a 100644
--- a/server-routes.rkt
+++ b/server-routes.rkt
@@ -4,6 +4,7 @@
 (require net/url)
 (require web-server/http/request-structs)
 (require web-server/http/response-structs)
+(require 2htdp/image)
 (require "world.rkt" "render.rkt" "readability.rkt" "predicates.rkt" "debug.rkt")
 
 (module+ test (require rackunit))
@@ -79,27 +80,7 @@
   (xexpr? . -> . tagged-xexpr?)
   (body-wrapper `(tt ,x)))
 
-(define/contract (bytecount->string bytecount)
-  (integer? . -> . string?)
-  (define (format-with-threshold threshold suffix)
-    ;; upconvert by factor of 100 to get two digits after decimal
-    (format "~a ~a" (exact->inexact (/ (round ((* bytecount 100) . / . threshold)) 100)) suffix))
-  
-  (define threshold-gigabyte 1000000000)
-  (define threshold-megabyte (threshold-gigabyte . / . 1000))
-  (define threshold-kilobyte (threshold-megabyte . / . 1000))
-  
-  (cond
-    [(bytecount . > . threshold-gigabyte) (format-with-threshold threshold-gigabyte "GB")]
-    [(bytecount . > . threshold-megabyte) (format-with-threshold threshold-megabyte "MB")]
-    [(bytecount . > . threshold-kilobyte) (format-with-threshold threshold-kilobyte "KB")]
-    [else (format "~a bytes" bytecount)]))
-
 
-(define-syntax-rule (when/splice test body) (if test (list body) '()))
-
-
-(require 2htdp/image)
 (define (handle-image-path p)
   (pathish? . -> . xexpr?)
   (define path (->complete-path p))
@@ -115,7 +96,6 @@
     (a ((href ,img-url)) (img ((style "width:100%")(src ,img-url))))))
 
 
-
 (define/contract (make-binary-info-page p)
   (pathish? . -> . xexpr?)
   (define path (->complete-path p))